In that case, be worth getting it checked out.
Could be a steering rack problem, or if front suspension arm bushes are worn could put more load onto front tyres. Steering column upper bearing sometimes needed replacing on Pre-99 corsa's, but that usually showed up as excess movement at steering wheel.
Are the tyres wearing normally, ie no bald areas on inner or outer of tyre.
The Vauxhall dealership I used to work at had an old Corsa van (1996) and the steering on that was so heavy, even a brute like me didnt like driving it.
cheers
CJ