Okay, it looks like Trident are the people to go to. Their range of screens are pretty good and given the single unit quantities I'm purchasing, the price isn't too bad either. It certainly beats buying a replacement laptop panel off of ebay and then trying to find a datasheet for it once it arrives. I'm getting an 8.4" SVGA panel with touch overlay for less than £150.

I've still got to make an LVDS cable up to fit my choice of motherboard, but hopefully once it arrives I should be able to get it up and running pretty quickly (famous last words).