The advantages of FPTP is it makes it easy for the electorate to kick the government out and punish parties that let their voter base down and the winners usually getting a majority at least means the electorate can expect to see a manifesto implemented which can’t usually happen with a coalition. However FPTP also creates a two party system and in order for that to be legitimate the vast majority of electorate have to be voting for one of the two main parties. If the polls are anything to go by > 50% do not intent to vote for the biggest two parties and a realistic choice of Tory or Labour isn’t democratic if more than 50% are choosing neither. You don’t want to touch the Scottish Parliament AMS system with a barge pole though. The list system puts more power in the hands of party bosses and means unpopular MPs can’t be kicked out if their party put them first on the list. The only system I know of that leaves the electorate with the say over the people who get in and still produces a semi proportional result for the parties is STV the one that is used in local elections in Scotland, if FPTP is past its sell by I would say let’s have that. Party list PR just has two many down sides, the party bosses have two much power over MPs, MPs that are unpopular with the electorate but popular with the party bosses can’t be kicked out.