Heath Colin Alridge & Ors v London Southend Airport Company Limited
Decision date: 11 March 2021
Neutral citation: [2021] UKUT 8 (LC)
Overall AI summary confidence: high
Short overview
This short overview is intended to summarise the case, issues and outcome so far as they are supported by the judgment.
AI confidence in this short overview: high
This case concerned 190 homeowners claiming property devaluation under Part 1 of the Land Compensation Act 1973 after a 2012 runway extension at London Southend Airport increased aircraft noise; ten representative lead properties were tried. The Tribunal found that most lead properties suffered noise-related depreciation by the first claim day (8 March 2013), rejected the claimant expert's repeat‑sales "growth foregone" quantification as overstating loss, rejected a separate uplift for future intensification, and assessed specific compensation amounts for the ten lead properties.
Ratio decidendi
This summary is intended to identify the ratio decidendi, meaning the legal reasons for deciding and the binding part of the decision.
AI confidence in this ratio decidendi summary: high
Compensation under Part 1 LCA 1973 is assessed by reference to market prices as they stood on the first claim day and must measure depreciation caused by physical factors existing on that day. Valuation methodologies must reflect market reality; repeat‑sales analyses that apply absolute differences across different market growth regimes can misstate the but‑for growth and overstate depreciation. Anticipated future intensification is only compensatable to the extent it was reflected in market value on the first claim day, not by a separate post‑claim uplift.
Obiter dicta
This summary is intended to identify obiter dicta, meaning observations made by the way that were not necessary to deciding the case and are not binding.
AI confidence in this obiter dicta summary: medium
The Tribunal observed that commonly used noise indices (Lday/Aeq, Lnight/Lden) are imperfect because identical index values can mask different subjective noise character and market reactions; market pricing may round effects to simple sums rather than precise fractional percentages. It also commented that long periods of indexation (up to 13 years) are unreliable for retrospective valuation and that shorter indexation periods (around 30 months) and robust valuation judgment are preferable when expert quantitative methods give implausible granularity.