In all seriousness, the best thing to do is have a Nationwide account - I kept my HSBC account when I moved here and it was the worst move I ever made - Nationwide is (by accident or design) a pretty much perfect "expat" bank account setup.
Basic (free) account gives you no charges for overseas withdrawals (no other UK account had that last time I checked about a year ago), no minimum pay in amount, and the rates on money transfers are very competitive. UK based friendly customer service.
All in all, I made a stupid choice by trying to make my UK account "work" over here, and I ended up tied into a 2 year £13 a month contract to get a worse overall service than the Nationwide would have given me for free. Thankfully that expires soon so I can close the HSBC account and open one with Nationwide instead
Obviously if you're really happy with Abbey and RBS then stick to it, but my advice based on my experience is, if it makes sense to move banks, move banks.