Labour MP's who have threatened to have me arrested: Number 3: Ivor Caplin

Well in fact it was the entire group of us he threatened to have arrested, or removed. We (Sussex action for Peace - Brighton's Stop the War group) were protesting outside the surgery of everyone's favourite junior defence minister in early 2005 when he sent out one of his staff (her name escapes me) to warn us that we were being too noisy and that anyone who wasn't a constituent with an appointment should leave.
Incidentally, following this protest, which was fairly visible, within a couple of days Caplin had announced he wouldn't be standing in the next election, a slightly odd move for a junior minister, and of course nothing to do with our protests.