One thing that's fun is getting a bank account (which you cannot do without a fixed address) and a place to live (which you cannot do without having a bank account).
Oh, and I forgot that to get a bank account you need a National Insurance number, for which they want to know your address.
(And to think that in the Netherlands I just showed up at the bank with my passport and proof of employment ... simpler times.) -----sapere aude
