For that particular fact, the first source of timestamps that springs to mind is my "parties" mail folder containing all the housewarming invitations! :-)

According to which, Impropriety held its housewarming on 10th May 2003 (but the invitation was sent out well before that on 24th April). Sherbourne Close was warmed on 26th October 2002, and the email said "a mere four months after having moved into the place".

(I wasn't entirely sure whether by "my last address" you mean the one you lived in before the current one, or the one you last moved into, i.e. the current one.)