'I used to weigh 24st – now I'm training for the Marathon des Sables'

Geoff Stockley used to munch on pastries, baguettes, fish and chips, foot-long Subways and KFC during lunch breaks, until a sobering visit to his GP Geoff Stockley used to munch on pastries, baguettes, fish and chips, foot-long Subways and KFC during lunch breaks, until a sobering visit to his GP