When the overweight drivers at a Plymouth taxi firm decided to take part in a six-week community weight-loss programme, two of them were so thrilled by the results that they decided to keep going.

Roger, 46, was dangerously obese at 31 stone, and Mike, 30, weighed 20 stone. This zippy half-hour one-off follows Roger and Mike’s progress as they attempt to make serious changes to their lifestyles and undo the effects of years of bad habits.

With the help of trainer Gavin Seymour, they both make impressive progress – but Roger’s valiant efforts are suddenly derailed when he is given some bad news about his heart