Its the GB registration number Phil.... the "2" = 2002 and the "5" = ummm October believe it or not = so it means its an October 2002 bike!!
(additional info, if it was "02" it would be February 2002, the "0" = February!!!). We only get February and August registrations now, ie. 02, 52, 03, 53, etc.
Its the new system that we went to after we ran out of registration letters to show the age of the vehicle!!!
Fran