EAT SMALLER MEALS WALK MORE EXE MORE
Oh, and definitely do not consider withholding insulin to lose weight if you hear about that anywhere. That is called diabulimia and is an eating disorder and a VERY bad idea (you can end up in DKA in the hospital) I'm glad to hear your wedding is next year and you have time to do it slowly though I don't know how much less 10 and a half stone is!
The same things that work for non-diabetics trying to lose weight work for diabetics. Reduce caloric intake and increase exercise. Many of us believe in low carb eating and the lower carb you eat you will also lose weight. Be sure if you do this to reduce your insulin intake as it will also lower your blood sugar. Obviously lowering fat intake will also help lose weight and you will have to eat a lot more vegies, salads, and more lean meat (skinless chicken or fish) to compensate. If you want to talk with more Type 1's who are looking to lose weight send me a private message and I'll give you a website.