A 1994 car will be rack and pinion equipped...
Don't think so Andy. Pretty sure R&P came in around '97 on the 4/4.
I stand corrected Graham , the +8 certainly had R & P from the late 80s. So in that case this is likely to be Gemmer boxed car. Although I have never owned one I am told these boxes are pretty good and require much less effort than the earlier Cam Gears.
I think it is possibly important to establish some datum points:
Have you noticed a deterioration in the effort required , or is it stiff when compared to other cars?
If the latter then as DaveW mentioned go for a steering bearing conversion which will make it a lot easier.
If the former is the deterioration rapid , or a slow decline? If the former then look for something incorrectly fitted. If the latter then a thorough lubrication of the stub axles and the steering damper pad is likely to be the key.