PS
Mick
If you want to try to avoid T2, then it's worth going on a low carb diet. It will help shift any surplus weight. If you need a formal diet plan, Atkins, South Beach and Protein Power are all available in books
Otherwise get a carb guide such as Collins Little Gem (either Carb or calorie guides) and do it your self.
Since a good low carb diet is high fat, you might help the Psoriasis too. Healthy skin needs fat.
I make no promises, but it's worth a try and doesn't carry any risks or cost much.