Talking to Richard, G4ERP on the way home last night, I had the idea of creating a SOTA Summits map for Google Earth. It's not absolutely precise at the moment, because I derived the lat/lon from the locator square, so the summit may not be 'quite' where the map says! I'm after the lat/lon information for the summits and when I get it, I'll reissue the map.
In the meantime, you may find the following link of interest - at least it gives a good idea of where each of the summits is!
SOTA Summits for the UK
Remember - you need Google Earth on your machine to try this out.