I admit to naming a street in Southampton "Innominate Road" for a while. Not really an Easter egg, just fed up of constantly encountering missing road signs round here....

Don't forget Freemap (www.free-map.org.uk) also has contours. True it only has central southern England ATM (you're in Wales I guess) but I'm going to try and fix it so it covers most of the rural areas of UK (the big cities bring my server to a halt...)