You can find statistics on the HESA site for the age of students when they start their degrees. I believe, that 79% of students on the first year of their degree are 20 or younger.
Good luck with it; presume fixed term, after that 35k oi oi!
A few hours away.
Emailed me last week for writing samples and to make sure it was ok to get onto references, so nothing 100% yet but I guess I have as good a chance as anyone else