How do I go about getting my rims and tyres out more just to the legal limit of the flare..is it as simple as getting wider rims and tyres? Also what's the widest I can run on the backs and front.

Thanks

You have to make sure you have the right offset too. Otherwise the extra width will just extend into the wheel well which you don't want. It can cause clearance issues with you suspension if your not careful.

I have 16s on atm and there seems to be plenty of room as the car isn't lowered yet..I know this may e a stupid question as I'm not familiar with wheel mods and upgrades .but what does the offset mean?

offset is how far the wheel attaches to the cars hub to the centreline of the wheel itself. if the offset is 0, then the wheels hub would be in the middle of the wheel, if the offset is positive then the wheels hub would be closer to the outer rim(front) of the wheel and if the offset is negative then the hub is closer to the inner rim(back) of the wheel. Basically the lower the offset the more deep dish wheel you would have. Have to be careful of offset as too high an offset along with width of the wheel could interfere with suspension components and to low an offset could interfere with the fender of your car.