Until we get proportional representation in this country and unless you live in a marginal seat area, then any vote against the majority party of the seat is in my mind a wasted vote, I still do it down here even though I know that my MP next session will be Harriet Harmon, the Lab Deputy Leader, whoever I vote for, that saying for London as a whole, I find that the following is the best we can get:
Lib Dem for local elections
Lab for London Assembly & Mayor
Conservatives for Parliament
I personally have always found myself with more money in my pocket with that arrangement even though it is not ideal, I still believe the way to go is proportional representation and get a better mix in Parliament, so that the 2 majority parties can be kept in check more.