Has anyone else seen this series? I love it and found it hilarious. It's a sitcom set in the early-mid 90s during the Troubles (Northern Ireland's conflict between Catholics and Protestants) - cue opportunity for lots of mid-90s music 
It's a Channel Four production, but I found it on Netflix, then just binged my way straight through the first series, which is only 6 episodes. The second series came out this year. If you're in the UK you can watch both series online via All4 (Channel Four).
Here's some clips of Sister Michael, the school's headteacher; it gives you a brief glimpse at some of the characters and type of humour:

It's a Channel Four production, but I found it on Netflix, then just binged my way straight through the first series, which is only 6 episodes. The second series came out this year. If you're in the UK you can watch both series online via All4 (Channel Four).
Here's some clips of Sister Michael, the school's headteacher; it gives you a brief glimpse at some of the characters and type of humour: