These are now available (and the price is right too). Rob apparently didn't post his announcement in 'walking', so I assume it only came out in 'climbing', but anyway you should be able to find the maps at:
In summary, they were created from space shuttle data using public domain data and software, as discussed here. In addition to contours, there are also UK outline (coastline), trig points and summits UK and Ireland) and some place names.
-- GSV Three Minds in a Can Outgoing Msgs are Turing Tested,and indistinguishable from human typing.
