The Christian Institute have produced a briefing
“AN ANALYSIS OF PARTY POLICIES ON ISSUES OF IMPORTANCE TO CHRISTIANS”
They are not there to support any party or candidate but do highlight where the parties (and leaders in some cases) stand on issues that Christians may think important.
Please take this in the spirit of the posting, I know there are those who would look at some factors mentioned as objectionable and some would take this as a guide on parties to avoid/support for opposing reasons to that intended. It is a document from a Christian organisation and does have a Biblical bias.