Hi Alan,
Pre-diagnosis (n Oct09) I was 18st (I'm 6ft 1in). I'm aiming for 14st.
The first thing I'd suggest is don't put too much pressure on yourself to lose weight (unless the medical guys say otherwise!). I've set myself to lose just 1lb per week and that means that I won't hit my target weight until November, 2010. As it happens, I'm currently ahead of schedule though!
I go for a brisk walk for 1hr a day (tends to be in one lump after lunch, but can be split into several walks if required). I've also invested in a rowing machine. Basically, I hate gyms and exercising at home is much nicer for me. I got myself a good quality rower for two reasons :-
1) Good quality equipment is more likely to last and to provide a good work out.
2) It costs more and so gives me the incentive to use it. Don't want to think that I wasted my money!
I built the exercise up slowly and am now doing 10km rows on the machine (takes around 36mins). Rowing is quite good because it is uses quite a few of the large muscles in the body.
The last thing I'd point out is that losing the weight slowly means that once the target is reached, I won't have to change my diet or lifestyle much (if at all).
Hope that it all goes well for you,
Andy 🙂