Yep - or it could be something as simple as tyre pressures. Get yourself down to Asda - they always have those decent (and free) digital air lines at the petrol station bit. I set my fronts to 32 or 33 PSI and the rears to 31 PSI. If it still feels like its fish-tailing after that, then it maybe (as others have said) a knackered tyre, balancing or tracking.
At least you can do the easy test yourself first!
D.