Never one to pass up a snazzy attention-grabbing subject line, me...
So, Gordon is going to let MPs vote on whether to let us vote on whether to have a new system of, er, voting - as long as they vote for the system he tells them to! This is called AV, and has been chosen over many other mechanisms such as STV, SUV, IVF ... sorry, getting confused here. But anything must be preferable to the present system, which is called FPTP, or WTF TATS.
So, here's a new idea - the antivote. In the future there will be two boxes against each candidate on a ballot paper. You can put your X (or number or whatever) in the first, just as in the current or proposed system. Or, you can put an X (or whatever there's room for) in the second box. This means 'Under no circumstances am I prepared to allow this asshole/criminal/sleazebag to represent me in anything, at all, ever.' Antivotes will be amassed and deducted from positive votes, if any, for the candidate in question. A net antivote score will result in the candidate's name and address being placed on a list. I leave it to you to imagine the uses this list could be put to.
A few details may need ironing out, but I think we're on the right track here.