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[Andy H]

.....
 and dont change pads n discs at the same time do one pair first  leave for a week then do other. pads 1st then discs.  .......

So, by your method, you're bedding new pads onto a worn disc, then when they're both bedded in together you put new discs on which need bedding in onto your worn old pads.  :-/ Far better to change both discs & pads together so you have flat new pads bedding in onto new flat discs! IMHO!     

x2

x3 I was resigned to having to fit new pads from the motor factors to keep me mobile until I could order new discs and new pads on T/C. I would never spoil new discs by using them with old pads.

The caliper has rubber seals that deform when the brake is applied and pull the piston back slightly when the brake is released. The sliding pins should also have rubber riings that serve the same purpose to pull the outer caliper away from the pad when realeased. Very light brake application might apply the inner pad first but my money is on the increased rate of corrosion on the inward face of the brake disc being the cause of that pad wearing faster.

My new car has 17" Elite alloys and both faces of the disc are quite exposed which is probably why there wasn't a big difference in wear on the pads on each disc. What is a little more puzzling is why the drivers side pads were more worn than the passenger side.