Vote trading I definitely approve of, I've done it myself and in the stupid voting system it makes sense.

What I really want is to split the cooperative party off from Labour, that'd be the best home for me overall given my economic preferences.

Where I live, it's Labour held, but we know they're looking at a meltdown, thus a Lib Dem vote is the best chance of stopping the bastard Tory (and he really is one of the worst sort)