You can take notes and you get hand outs with timelines, cctv images etc on. Mind you, it was only when we started deliberating that it became clear at least one jury member hadn't taken any notes at all over the 2-3 weeks, and another had such a poor grasp of English that he hadn't understood a lot of the evidence. We also had a little old racist OAP from Romford who was thick as mince, whinged non-stop, and needed a fag every half an hour, which meant we all had to traipse out and stand out the back with her.
It was painful. Took 3 or 4 days to agree on our verdict because of one juror who kept getting cold feet. I was so excited to have been called, but I'm so, so pleased I've been excused from doing it again.