magic, if you've got a fixed rate mortgage then there are quite severe penalties to be paid for selling up before the fixed term ends - it would be best to sell it to him probably.
you could do a transfer of equity to get him on there in place of yourself (about £400 legal fess i think - takes at least 6 weeks to go through though), and then get him to buy out your share of the equity.
and then get the beers in, you're free again.
that sounds good to me.
hopefully he'll want to do it so i can go get the beers in