@JayeNM thanks for the great advice on the various points I will be looking on Amazon for the Bar Keepers Friend you suggest
Immediately after my last post I went to music medic's sight and found that you could order a set of pads for a king Zephyr and it seemed you could specify them in white Roo for in the region of $80 plus some extra for any chosen resonators and they gave a guarantee to change up to 4 incorrectly sized pads at no extra cost as long as they were requested all at the same time which seemed to be a good deal.As far as the resonaters go they didn't seem to have an option for smooth black coated metal resonaters or even black plastic so that's a minor problem.I haven't contacted them yet to see if they would send to England so that might be another.
In their advice they say that many manufacturers used different thickness of pads between the lower and upper stacks so that would be another problem as is deciding the best thickness too use in the first place all part of the joys of being a novice I suppose.
I do already have a set of digital callipers so measuring the cups and pads wouldn't be a problem but from past experience I have found that even after ordering to your own measurements your lucky to get within two or three of a complete good fit on all pads.
Thanks again for your help I might just be contacting you for further help.