From Canon Christopher Hall

Sir, — Wise bridesmaids (such as Bradford Cathedral) got into photovoltaic (PV) cells early on their south-facing roofs, as John Madeley urges parishes to do (Letter, 18/25 December). St Peter and St Paul, Deddington, had 40 PV panels installed in January 2012. Parishioners funded the panels with Gift Aid donations or interest-free loans, all now repaid. In four years, 33,749 units of electricity have been generated, plus an annual income of £3500, and 17 tonnes of carbon dioxide kept out of the atmosphere. Less wise bridesmaids (given admission by DACs), even with a much reduced assured income, can still cut running costs and help to keep the rise in global temperature below the 2°C target agreed in Paris.

CHRISTOPHER HALL
The Knowle, Deddington
Banbury OX15 0TB