A beauty from Hansard 6 Dec:
Kevin Brennan (Cardiff West) (Lab): On a point of order, Mr Speaker. Can you confirm that it is in order during a Division for hon. Members to walk through both the Aye and the No Lobby if they seek to register an active abstention? For those who are not sure how to vote on Thursday in the tuition fees vote, would that not have the advantage of allowing them to say that they voted both for and against it, depending on their audience?
Mr Speaker: Yes.
http://www.publications.parliament.uk/pa/cm/cmtoday/cmdebate/03.htm