Wrote Potlatch, scanned the NPE maps, founded geowiki.com, cycled many many GPS-enabled miles, and am based in Charlbury, natch. Generally to be found making a nuisance of myself on the mailing lists.

OpenStreetMap allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth.

OpenStreetMap's hosting is kindly supported by the UCL VR Centre and bytemark.