The lightweight world amateur boxing champion was one of Britain's brightest medal hopes in China but he withdrew after failing to make his weight.
The 22-year-old had benefited from Lottery funding worth £70,000 a year in the run-up to the Olympics.
UK Sport said it was the boxer's responsibility to make the weight
BBC SPORT | Olympics | Boxing | Gavin withdrawal under scrutiny
£75K a year (That's $150,000!!) I'll get my weight down if you pay me that much! Look! I'm dieting already!!!
So do you think it was his responsibility to get his weight right? It's not like he didn't have a long while to do it-- but then he's a growing lad, could he just be getting naturally bigger???