Thanks Yellow,Fat buddha,and Sean G. The trainers (saucony grid stabil mc 5's) that i will be doing the London and Edinburgh marathons in are what i am running in now without any problems,so better to save new trainers for the marathons then.
I wear these trainers because i am a fairly severe overpronater,I get on alright with them but find them a bit on the heavy side.Any sugestions on any alternative shoes