Is it too late to change my course at Durham?

Well I've managed to switch from Biology to Natural Sciences with no problems on Durham's part so I don't see why you shouldn't be allowed.

how did you do this? was it before or after you went to durham..? ive applied for mmath but im starting to think id like some economics as well...so i think natural science may be better for me...but ive no idea whether i should just wait until like a month after i arrive (hopefully ) when i'd have a better picture of what to do but then would that be too late?

I knew I wanted to do Natural Sciences so I had emailed the Director of Natural sciences (nicest guy ever, btw) and he told me and it was true that all I needed to do was a change of registration form. Basically, I would email him (find his email on the Durham website) and just see what the options are, check the module compatibility and normally most courses will let you swap around until around the first month of term

Ok great that's really useful! Also I'm just looking now at the subjects and modules you can do. It says the largest number of modules you can take for one subject is 4, but what's the total number of modules your supposed to take for the first year? I'd like maths to be the majority of my course but I can't tell if 4 modules is a majority or only like half which wouldn't be enough for me. I think most of the modules I'd be doing are worth 20 credits each if that makes a difference.