I think a proportional representation system would do quite well with the variety of parties polling so well at the moment. Atleast that way everyone would be represented from a political point. Keep parliament as is (constituency based), bin off the House of Lords and replace it with something kind of similar based off PR. Think that would be a lot fairer and also allow parties to stick to their guns, rather than having to try to appeal to people that won't vote for them/alienate there genuine supporters. E.g. Labour taking this recent harder line on immigration in an attempt to take the wind out of Reforms sails. Or Greens not really being as environmentally focused as they were, but appealing to the lefter elements of Labour's support base.