Hi everyone, thought I'd report back since I just finished my duty. It was OK, I was on one case that lasted the full 2 weeks - there were talks of it spilling over to Monday but it didn't.
I found it quite interesting (obviously not allowed to say what it was about but it wasnt fraud or drunk driving or anything like that), but at the same time there was a LOT of waiting around. On the first Monday I wasnt called for a case so just had to sit there from 9am-4.30pm (managed to read a whole discworld novel in one go). I was finally put on one on Tuesday at 4 and was about to lose the will to live so I'm glad I got picked. There was a lot of going down to court, waiting around, going in listening to something for 15mins then being sent back upstairs. One day we were told to get there for 10, were then waiting around til 12.30 - to be told to come back at 2, came back at 2 to be told oh actually you can go home. Apparently this isn't normal the case just had a lot of legal stuff to figure out behind the scenes.
My advice would be to bring a book (that you dont mind reading for 8 hours in one go), and dont make any plans for the week after. There was one case they announced was going to last 3 weeks - if you couldnt do it tell them. However, this one they didnt expect to last as long as it did.
So yeah that was my brief non-disclosing summary. The ushers and staff were all soooo nice (even the security gaurds), and they made it as easy as possible. Phew! I wouldnt be too irritated if I was called to do it again, met some nice people.