UCL has 7 offical football teams...ucl 1st, ucl 2nd......ucl 7th.
I played for ucl 4th which was mainly second years except me and one other, but quit after a few game cos it takes up the whole of wednesday since our homepitch is far away (around 40 mins drive, by the way watford train there!).
ucl 1st and second, is VERY VERY competitive, they make you train 3 times a week + match + make you wear a suit to the matchday.
Also you have departmental football teams and other society football teams like one slovakians, which are less competitive.