strathavan, If those who changed your gaiter, and the Jack knight requires that the rack is removed as the gator is a one piece affair, didn't change the track rod length ie. refitted them exactly as removed which is not hard as you don't need to loosen the lock nuts at either end.
So your thoughts that loosening the rack mounting blocks and repositioning the rack to centralise the steering wheel is correct, assuming the steering was centralised in the first place. I think Richard was saying that It might be an opportunity to fully check the steering alignment which is an unknown at the moment. This will achieve several things in that you will see how the car drives when the geometry is set as it should be, you might be very surprised how well a fully aligned mog will drive, the feedback weight through the wheel and a more relaxed drive for the driver is usually felt. Tyre wear on such a light car is often not a good indicator of bad tracking unless radically out of line or used very regularly. And lastly I would have expected the fitter to have retracted the car if he changed steering rack track rod length and charged for it!