Thanks - actually, I need a source accessible out of working hours, as our libraries now are only open when I am in school, which is until very late. I'm in that state called work rich, time poor, not to mention energy depleted and other negative states. The preacher was John Ball, a Lollard, who was imprisoned in Maidstone gaol until released by the Kentish part of the rebellion. Wat Tyler was with the Essex bunch, although there has been some argument about that, as everyone wanted to claim him, and the Thames isn't that wide. There's a nasty story in Dartford which tells how Tyler's daughter was examined by a poll-tax inspector to establish if she was adult, and was punched by Tyler, killing him. The business was much too well organised for that to have been the start of the rebellion, and it was only Tyler's doing if it was someone else with the same name. Not impossible with the way peasants did things later, like the French Jacques, and Captain Swing, Rebecca etc.