I've had two go through uni. The loans are always split unevenly but with no obvious pattern or explanation. This is a shame because by far the most expensive term is the first one and the third is the cheapest mainly because it's very short - if their last exam is in May they have effectively finished even if term officially goes to July. Also beware the third year loan is smaller.
Thanks Citadel and Hortz. I just read on a post on Thestudentroom that the split is 33% for each of the first two terms, 34% for the summer term. Does that sound right? I can't find anything on this on the official student loan websites.