Thanks gents, appreciate the advise and I'll try inflating to 40psi. I agree, I would have expected to see equal wear on the inner edge if it were down to tyre inflation, that said there is some wear to the inner edge of both tyres and whilst its not as excessive as the outer edge I'll pump them up and see how I get on. The tracking was checked by a local tyre firm, however I've used them many times before and they are highly recommended (ironically, my local Ford dealer also recommended them as their equipment is far more advanced than Fords own). Thanks again for the advise, I'll keep you posted.