Data as of: DVSA MOT results to 2025
Ariel Leader: MOT pass rate by registration year
Which Leader years pass first time, and which fall short of the model's 92.7% average, from 1,135 DVSA tests.
Pass rate by registration year
Highest pass rate: 1963 (96.5% of 85 tests). Lowest: 1971 (87.5% of 64). Years more than two points below the model average: 1965, 1971.
| Registered | Tests | First-time pass | vs model (92.7%) |
|---|---|---|---|
| 1959 | 164 | 92.7% | +0.0 pp |
| 1960 | 207 | 93.7% | +1.0 pp |
| 1961 | 208 | 92.8% | +0.1 pp |
| 1962 | 177 | 93.8% | +1.1 pp |
| 1963 | 85 | 96.5% | +3.8 pp |
| 1964 | 96 | 92.7% | +0.0 pp |
| 1965 | 81 | 87.7% | -5.0 pp |
| 1971 | 64 | 87.5% | -5.2 pp |
Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years. A first-time MOT pass is a roadworthiness check, not a full mechanical inspection.
Pass rate over time
Questions
- Which Leader years have the lowest MOT pass rate?
- 1965, 1971 registered examples pass first time less often than the Ariel Leader overall (92.7%); the 1971 cohort is lowest at 87.5% from 64 tests.
- Which Leader year has the highest MOT pass rate?
- 1963, at 96.5% of 85 first tests (2005–2025).
- How much does the Leader pass rate vary by year?
- 9.0 percentage points between the highest (1963, 96.5%) and lowest (1971, 87.5%) cohorts with at least 50 tests. Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.
Full report: Ariel Leader reliability, failures and mileage · ranked #344 of 5428 models· other Ariel models: Arrow, Red Hunter, Huntmaster, Square Four, NH, VH