I did service on a case ten years ago – armed robbery and false imprisonment.
It was unusual in that the accused was actually in prison at the time, and had, it was alleged, committed the crime on weekend release.
Being a notorious criminal, he was actually under surveillance by the police when he went to the robbery, with videotape shown in court. They hadn't quite caught him in the act, though, which was presumably why the whole thing went to court.
A unanimous verdict was required, which I thought would literally take 5 minutes. It ended up taking 12 hours, an overnight hotel stay, and a majority verdict being submitted – two jurors just weren't completely sure.
It was in Liverpool crown court (had to be, really, didn't it). It was really eye-opening how the defending QCs tried to confuse the jury with obfuscatory and mis-leading statements. I knew it was their job to defend their client, but I was surprised at the bare-faced bullshitting they were prepared to do. You could see that it worked, as well.