You could shave a couple of stone off by cutting down on the carby grub and just walking everyday. Large lads lose lard quicker. Pissing against the wind if you just exercise. Theres no easy way around it, there has to be a calorie deficit.
If youre 22 stone your daily calorie allowance is 2420 kcals per day if you want to lose 1lb pw.
Thats the equivalent to roughly 12 cans of guinness or a Fresh cod, chips and 2 slices of buttered batch and a cup of scald with milk or
3 medium big mac meals with Diet coke per day.
Or you could eat tons of rabbit food with skinless chicken for breakfast, dinner an tea. Most diets allow for endless amounts of vegetable. Bottom line. Some willpower is required.