Hi Simon. Definitely interested here.
I have a real problem with mine. I just got 2.3 MB/s download which is pretty fast for me. It's generally 1.5-2 MB/s which is awful (although it's not that long ago on dial up that it was unthinkably fast !). Seems similar to Tom and I think it's slower in the evening.
My Netflix is generally ok but I cannot watch HD movies on Blinkbox due to the lack of download speed. Looking at recent speed tests in the area they seem to be in the 3-4 MB/s range. Someone recorded over 20 MB/s which is something I'm pretty jealous of !