Britain is set for one of its warmest summers in recent years. With June seeing its hottest day since 1976, and the mercury to hit 30℃ this week, many of us will be spending a lot more time outside, in parks and beer gardens, at barbecues or on holiday.

But as the beer and burgers flow, it's easy to be adopt a carelessness towards diet. Which is perhaps why Greggs, the high street pasty chain, have decided now is a good time to launch their own diet plan.

Its 'Minimise Me' plan – a play on Morgan Spurlock's 2004 documentary Supersize Me – suggests customers can lose weight by eating only Greggs producce for a month. And that includes all the usual doughnuts, bacon rolls and sausage rolls associated with the brand.