Eurogatwick RJ100 (same for 737):
Guaranteed min 10 days off every month (Feb 9) This month I managed to score 13 days off.
42 days leave a year and we get three wraparound days to choose to have either at the beginning or end of each 7 day block. On a 14 day block you get three either side. These wrap days obviously come out of your 10 days off in a month.
Also get any extraordinary bank holidays (such as this year's jubilee) awarded at some point in the year.