One point that I had to confirm a few times was regarding the 5 year residency. I still have another 10 days to go to complete 4 years on WP and 1 year on ILR. This is because of course you get ILR after 3y and 11m. So even though I have been on ILR for 12 months now, the over all WP+ILR is < 5 years.
I told him that but apparently as long I was in the country before the work permit (as I was as a student), it doesn't matter. I was really unsure about this and I had to confirm with him quite a few times up to a point where it got a bit embarassing

Apart from that it was great!