OFM Awards 2015 best ethical restaurant: The Clink, HMP Brixton

There's local food, recycling, composting " but at a restaurant staffed by inmates, it's the sustainability of people that's most important

• Read the full list of regional runners-up here

A waiter, in a smart, checked waistcoat, reels off a list of today's ice-cream flavours, all made in-house: "Strawberry, stem ginger, rum and raisin ""

"Rum?" says Ross Wryde, my dining companion, with a smile and a raised eyebrow. "How d'you get that in?"