Yeah I've done it loads Crowie. Not necessarily to take advantage of the free bets but more to get my betting bank in order.
You could always open an online account (if you haven't already) at somewhere like Cahoot. I did this so as to keep m current account separate from my betting. You don't need to speak to anyone to open an account and it'll be set up within the week I think.
I'm guessing you'll be 'arbing' to maximise your free bet returns?
If not drop me a line and I'll explain.