Jeremy Bentham's pickled head

From the UK, Mark Bennison writes: "As an alumnus of University College, London, I thought I would add to the Jeremy Bentham story. In case readers were wondering why there is a wax effigy of his head, and not the real one, on display, it is because the real (pickled) head is locked away in the university's vaults. This is due to the head being repeatedly stolen as a trophy by students of rival London universities!"