Whats the widest alloys do you think i can fit on my car without doing any cutting to the bodywork?
I believe that It depends on the offset of the particular type of wheel as opposed to just it's width. So the biggest width you can get away with, will probably differ from wheel to wheel. To be honest it's not my area of expertise, so you might be better off starting a new thread that asks exactly that question.
Personally though, I'm of the belief that you can never go too far wrong with a standard set of 12 x 4.5" minilites in order to give it that classic look. They will bolt straight on and will instantly look loads better than a set of steelies. Also because so many mini owners remove them to fit wider or even 13" or 10" rims, then there are loads of them available. You can often pick up a reasonable set of them with tyres for around £60 -£100..... leaving you with a whole heap of cash left over to spend on something else!!