Just finished a survey at this site
http://voteforpolicies.org.uk/
Which presents you with a choice of manifesto commitments on all the main political areas - crime, health, education, welfare and so on - from all the major political parties, but without explicitly identifying which set of pledges comes from which party.
I was quite surprised at my own results, which are actually somewhat at variance with the political party I would normally vote for - it will also give you details on the overall views of any other contributors from your constituency.
Have a go, if that sounds interesting - see what you think :)