Still with the Big 4? Unfortunately they've tightened up a lot these days, it used to be the case that it was very simple to get a job on the IOM, then just transfer to one of the London offices after a year. I had a job interview back in the day with Coopers and Lybrand in London, it was spread over two days and I didn't get the job. My job interview with PwC over here consisted of a half hour chat with the senior partner, 15 minutes of which was about football.
Sounds about right r.e IOM interview - the person who interviewed me for what was the 'final' interview actually burped loudly upon entering, which did break the ice somewhat!
It's actually quite easy to transfer internally at my current firm provided it is with local blessing, although I wouldn't really want to move within audit - the opportunity is with an investment bank.. best keep that quiet on this forum however! Still not 100% either way though, I would be very happy to take a good opportunity on Island.