Looks promising. Seems pretty similar to the spreadsheet I'm currently using.
Would be nice if you could enter which shoes you ran in and have it track how many miles you've run in each pair. Also if you could export your data (e.g. to .csv or xml), although cutting and pasting sort of works.
One more thing. How come the January Challenge started on the 2nd? I'm sure I wasn't the only one out running on New Year's Day.
Currently, if you transfer numbers the worst that can happen is that the person running with someone else's number gets disqualified. The new rule allows for some sort of disciplinary action against both people.
I'd assume they can only discipline you if you're a member of UKA. Can't see what they can do to you if you're not.