nick123:
Nope. Still avoiding your direct question. Have you checked your credit report? It may be that the gap is not evident in which case you do have a previous address, or alternatively record an explanation.
If you haven't checked your credit report before you can obtain a £2 statutory paper report, pay more for an online report, or get a "free" report so long as you remember to cancel.
If going "free" make sure you go direct to the CRA website and not via a referral website.