Thanks girls all thats very helpful - if some a bit scary that it is only going to get worse!! I find the worst bit is the change of position- but will get there - i think that some of it after sammi's description may be my still favouring my knee after my reconstruction in august last year - will have to be more concious of not doing that anymore.

Thanks for all the great advice will try a few of the techniques to see if they ease it a bit before going for the belly belt...