England's Smallest Highway Authority: 14.48km on One Island
The Council of the Isles of Scilly maintains just 14.48km of adopted roads on St Mary's — within a 16km² archipelago and with zero B or C roads. The DfT awards GREEN for condition and spend, yet the overall rating is AMBER because best practice is RED: one survey since 2022, reactive pothole repairs as the default, and no preventative programme planned for 2025/26.
A Network Unlike Any Other Authority
The council's own transparency report describes a highway estate scaled to island life — not mainland county metrics
| Asset type | Length (km) | Notes |
|---|---|---|
| A-roads | 7.56 | 52% of carriageway network |
| B and C roads | 0 | No classified B/C network at all |
| U-roads (unclassified) | 6.92 | 48% of carriageway network |
| Total roads | 14.48 | St Mary's adopted carriageways only |
| Footways | 6.68 | Includes DVI where RAV could not access |
| Cycleways | 0 | LCWIP adopted 2023 for future walking/cycling routes |
St Mary's only — not the whole archipelago
The council manages highway assets on the island of St Mary's only. Its statutory responsibilities do not extend to inhabited off-islands — St Agnes, Bryher, Tresco and St Martin's.
If your incident was on a ferry-served off-island, confirm which authority maintains that road before submitting a claim to the Council of the Isles of Scilly.
What else the council maintains
Beyond carriageways and footways, the network includes railings, gullies and manholes, traffic signs, junction markings, streetlights, bollards, slipways, verges, landscaped areas, drainage and road markings — all on a scale the council describes as reflective of the islands' “small scale and environment.”
“The Council of the Isles of Scilly, as Highway Authority, manages a small amount of public highway network, compared to mainland authorities which is reflective of the island's small scale and environment (total area of the Isles of Scilly: 16km2).”
— Council of the Isles of Scilly Local Highways Maintenance Transparency Report (30 June 2026)
One Survey, One Snapshot
Condition data exists for 2022 only — the council commissioned its first SCANNER assessment that year
| Year | Red | Amber | Green |
|---|---|---|---|
| 2020 | No data collected | ||
| 2021 | No data collected | ||
| 2022 | 0.99% | 33.32% | 65.69% |
| 2023 | No data collected | ||
| 2024 | No data collected | ||
“Using mainland assessment criteria would lead to an overspecification for the A roads and potentially highlight sections of the carriageway that are, in reality, fit for purpose. To ensure an objective, sensible assessment of the whole network the Condition Surveys assessed the survey data against the mainland C road thresholds, irrespective of the nominal classification assigned.”
— Council of the Isles of Scilly Local Highways Maintenance Transparency Report (30 June 2026)
“The areas of highway (carriageway) which show Amber or Red results are largely those areas that were not resurfaced in 2014.”
— Council of the Isles of Scilly Local Highways Maintenance Transparency Report (30 June 2026)
Why GREEN condition still leaves claim angles
The DfT Condition scorecard is GREEN because RED share sits below England averages. But the council's own analysis shows over a third of the network (33.32%) in Amber — maintenance may be required soon — and the survey is now three years old with no follow-up published.
If your pothole sits on a section not resurfaced in 2014, the council has already mapped that corridor as higher risk in its own 2022 assessment. That is more useful to your claim than the headline GREEN badge.
Spending Above DfT Allocation — On a Tiny Network
Five years of capital and revenue maintenance spend from the council's transparency report
| Year | DfT capital allocation | Capital spend | Revenue spend |
|---|---|---|---|
| 2020/21 | £89,000 | £0 | £105,000 |
| 2021/22 | £0 | £0 | £115,000 |
| 2022/23 | £0 | £16,000 | £115,000 |
| 2023/24 | £0 | £18,000 | £142,000 |
| 2024/25 | £0 | £21,000 | £119,000 |
| 2025/26 (projected) | £53,000 | £126,000 | £92,000 |
More Than Double The DfT Cheque — Per Kilometre
Projected 2025/26 capital spend of £126,000 against a £53,000 DfT allocation earns the GREEN Spend scorecard. Island delivery costs are higher — the council cites limited economies of scale and specialist plant access — but aggregate spend does not tell you whether your specific defect was inspected or repaired in time.
247 Pothole Repairs in Five Years
Reactive filling on a network where the council admits most work has been pothole-led, not planned
| Year | Potholes filled | Per km of network |
|---|---|---|
| 2020/21 | 45 | 3.1 per km |
| 2021/22 | 50 | 3.5 per km |
| 2022/23 | 45 | 3.1 per km |
| 2023/24 | 69 | 4.8 per km |
| 2024/25 | 38 | 2.6 per km |
| Five-year total | 247 | 17.1 per km |
“To date the majority of maintenance work to the highway carried out by the Council has been reactive – mainly on pothole repairs.”
— Council of the Isles of Scilly Local Highways Maintenance Transparency Report (30 June 2026)
“Following a trend from previous years, there is likely to be in the region of 40 potholes that require re-filling as part of our reactive works.”
— Council of the Isles of Scilly Local Highways Maintenance Transparency Report — 2025/26 plans (30 June 2026)
2023/24 peak: 69 fills
The highest year in the five-year table — nearly five pothole repairs per kilometre of adopted road. On a mainland county that figure would be invisible; on 14.48km it means defects are still forming and being patched reactively, not eliminated through planned resurfacing.
No preventative programme for 2025/26
The council states plainly: “There is no preventative works planned at present for 25/26 as the priority work required falls into reactive.” Amber and Red sections from the 2022 survey are targeted through reactive resurfacing if kit becomes available — not a rolling preventative programme.
Why Best Practice Is RED
The council's own report documents the asset-management gaps behind the DfT's weakest scorecard
Survey and data gaps
- • Only one SCANNER/RAV condition survey — commissioned in 2022
- • No highway condition data at all before 2022
- • No published condition data for 2023 or 2024
- • PAS2161-accredited surveying required from 2026/27 — not yet in place
Maintenance approach gaps
- • Majority of historical work reactive — mainly pothole repairs
- • No preventative works planned for 2025/26
- • HMM and Asset Management Policy adopted but full lifecycle planning still developing
- • Three-to-five-year rolling programme promised only beyond 2025/26
“The Council's ability to achieve full benefit from asset management principles is reduced because of limited economies of scale, challenges in accessing specialist plant and equipment and the additional resources and skills that may be required. Cost implications for delivering on the islands is likely to be higher due to these issues.”
— Council of the Isles of Scilly Local Highways Maintenance Transparency Report (30 June 2026)
Why This Matters For Section 58
To rely on the Section 58 defence, a council must show it had a reasonable system for knowing the condition of its roads and acting on defects. For the Isles of Scilly, ask:
- • When was your road last condition-surveyed — and was it in the 2022 exercise or never?
- • If Amber/Red sections map to areas not resurfaced in 2014, was your defect on one of those corridors?
- • Did you or anyone else report the pothole before your incident — and what was the response time?
- • With no preventative programme for 2025/26, how does the council demonstrate proactive knowledge of deterioration?
A GREEN condition badge built on one 2022 survey does not prove the council knew about your specific defect in 2025 or 2026 — especially where best practice is RED.
Atlantic Exposure and the 2014 Baseline
Island context the council itself raises — storms, sea-level rise and a decade-old resurfacing programme
Climate resilience
The council states the islands are “significantly at threat from Climate Change, specifically sea-level rise and increased storm activity,” which poses the greatest risk to highway sustainability. Its Resilient Island Strategy calls for adaptation pathways for infrastructure including highways.
Atlantic weather accelerates surface deterioration on exposed St Mary's routes — relevant when assessing whether inspection frequency matched the environmental risk on your road.
The 2014 resurfacing cliff
The council says good overall condition “largely reflects the investment made by the Council in 2014 when the roads were resurfaced.” Amber and Red results from the 2022 survey concentrate on sections outside that programme.
Roads not treated in 2014 are now eleven years into a cycle without a full preventative programme — pothole patching is the stated priority for 2025/26.
2025/26 planned works
The council is seeking opportunities to resurface larger Amber and Red areas if kit and equipment become available on the islands — framed as reactive works, not preventative. Some footway sections also require resurfacing from condition assessments and local inspection.
Beyond 2025/26, the council promises a prioritised rolling three-to-five-year programme derived from annual service, specialist surveys and inspections — but that is not yet operational.
Claiming Against a GREEN Condition, RED Best-Practice Council
Honest assessment: small network, decent snapshot data — but process weaknesses open specific angles
What works in the council's favour
- ✓ GREEN condition — 0.99% RED at 2022 SCANNER survey
- ✓ GREEN spend — projected capital more than double DfT allocation
- ✓ Highway Maintenance Manual and Asset Management Policy published
- ✓ SCANNER-compliant RAV survey plus walked DVI for footways
- ✓ LCWIP adopted 2023 — long-term active travel planning underway
Expect the council to cite GREEN scorecards and its 2022 survey on roads resurfaced in 2014. Generic claims on well-maintained sections will struggle.
What works in yours
- ✗ RED best practice — single survey, no 2023/24 data, reactive default
- ✗ 33.32% of network in Amber — maintenance may be required soon
- ✗ Amber/Red sections mapped to roads not resurfaced in 2014
- ✗ 247 pothole repairs in five years — reactive patching, not prevention
- ✗ No preventative works planned for 2025/26
- ✗ Off-island incidents fall outside council highway responsibility
The winning strategy here is specificity
Against a council with GREEN condition on a tiny network, your claim lives or dies on the specific defect and location:
- • Confirm the incident was on St Mary's — not an off-island road outside council responsibility
- • Prior reports of the same pothole (council form, FixMyStreet) — proof of actual notice
- • Photos showing defect size, depth and visible age (weathered edges, previous patching)
- • Whether the road section was in the council's 2022 Amber/Red category — especially if not resurfaced in 2014
- • Atlantic exposure and storm history on that specific route
Mac builds exactly this case: he searches for prior reports, assesses your photo evidence, and cites the council's own transparency data where it helps you.
Report the pothole on St Mary's first
Reporting creates a dated record that the council knew about the defect — useful if it was reported before your incident or left unrepaired. The council's highways team covers St Mary's only; contact highways@scilly.gov.uk for further information.
Report a pothole to the Council of the Isles of ScillyUse the online form with location, photos and contact details. Keep your reference number and any confirmation emails.
Hit a Pothole on St Mary's?
England's smallest network still demands a precise claim. £35 for a professional claim pack.
DIY claim
- • Submit photos and invoices
- • Use generic template letter
- • No 2014 resurfacing gap cited
- • No RED best-practice process gaps argued
- • No prior-report search
Professional claim pack
- ✅ 14.48km network scope and St Mary's-only jurisdiction documented
- ✅ 2022 Amber/Red sections and 2014 resurfacing gap cited
- ✅ RED best-practice and reactive-maintenance record referenced
- ✅ Prior reports searched and attached
- ✅ Section 58 rebuttal tailored to Isles of Scilly data
No percentage fees. You keep 100% of any compensation.
Frequently Asked Questions
The Isles of Scilly has a GREEN condition rating — can I still claim?
Yes. The DfT Condition scorecard is GREEN because the council's single 2022 SCANNER survey found just 0.99% of carriageway length in RED condition. Your claim turns on the specific defect that damaged your vehicle, not borough-wide averages. The council itself says Amber and Red survey results "are largely those areas that were not resurfaced in 2014" — so location on the network matters. Section 58 depends on whether that defect was reasonably inspected and repaired in time.
I hit a pothole on Tresco, St Agnes, Bryher or St Martin's — who is responsible?
Not the Council of the Isles of Scilly for adopted highways. The council's transparency report states its responsibilities "do not extend to the rest of the archipelago of inhabited off-islands (St Agnes, Bryher, Tresco and St Martin's)." It manages highway assets on St Mary's only. Check who maintains the road where your incident occurred before you claim.
Why is best practice RED when condition is GREEN?
The DfT Best Practice scorecard is RED because of process gaps the council itself documents: only one condition survey (2022), no highway condition data before that date, majority reactive maintenance historically, no preventative works planned for 2025/26, and limited economies of scale on a 14.48km network. GREEN condition reflects a single snapshot; RED best practice reflects how the council measures, plans and maintains that tiny network over time.
The council filled only 38 potholes in 2024/25 — does a small number weaken my claim?
No — scale is relative. On 14.48km of adopted roads, 38 pothole repairs in one year is still roughly one reactive fix every 10 days. The council forecasts around 40 refills for 2025/26. Over five years it recorded 247 pothole fills. A small absolute number on England's smallest highway network still shows defects forming between inspections — especially where the council admits work has been "mainly on pothole repairs" rather than planned maintenance.
Does the council spending more than its DfT allocation help its Section 58 defence?
It can strengthen the council's position on aggregate funding — projected 2025/26 capital spend of £126,000 against a £53,000 DfT allocation earns a GREEN Spend scorecard. But Section 58 turns on the specific defect: prior reports, inspection records for your road, and whether reactive pothole filling addressed the hazard before your incident. The council's own report says it is "working towards" asset management principles but delivery is constrained by island scale and remoteness.
Should I report the pothole to the council before claiming?
Yes. Reporting creates a dated record that the council knew about the defect — useful if it was reported before your incident or left unrepaired. The council publishes a dedicated pothole reporting page and can be contacted at highways@scilly.gov.uk for St Mary's highways. Keep reference numbers, confirmation emails and photos.
Does climate change and storm risk mentioned in the report affect my claim?
It provides context, not a free pass for either side. The council states the islands face "significant" threat from sea-level rise and increased storm activity, which poses risks to highway sustainability. That is documented awareness of elevated environmental stress on St Mary's roads — relevant when asking whether inspection and repair frequency was reasonable for a network exposed to Atlantic weather, but it does not automatically establish or defeat liability.
Data sources: Department for Transport — Local Road Maintenance Ratings 2025 to 2026 | Council of the Isles of Scilly Local Highways Maintenance Transparency Report (30 June 2026). Contains public sector information licensed under the Open Government Licence v3.0.