Thanks Phil, it looks really useful.
I have noticed a couple of issues with rides local to me.
JWA01 "Surrey Hills" has a control at Coldharbour but the map shows a Coldharbour in Gloucestershire. I changed the lat/long to the correct Coldharbour for this ride and I don't think any rides use the Glos one.
Clicking on Richmond upon Thames on the map brings up "The Ditchling Devil" which is correct, but also DA01, DA04, DA05 and AC19 which start or control in Richmond in North Yorkshire. I wasn't sure how to add a new control to the list so have left it for a more competent person.
DA02 and DA03 start in Richmond, North Yorkshire but as "Richmond" isn't in the control list they don't appear in either place on the map.