FWIW when I migrated to them I put in my Mac code on the Tuesday morning and was migrated on Friday. I've no idea why it should vary between ISPs but AA do seem to be one of the quickest wrt migrations.

From bulldog it's no such luck. You have to give them a months notice and also tell BT to grab your line back (BT can do this before the month is up). Then you have a clean line, and you can get ADSL installed which officially takes 5 working days.

I've been waiting for LLU migration to happen for months but Ofcom don't seem to be in any hurry so I have to do it the hard way..

OK the order is in.. "Excellent techincal support" sells it

You wont regret it, but even if you do (?!?!?) you are only tied in for a month at a time.