Since labour would have won (by one seat) if it weren't for libdem voters coming back to Labour and thereby handing 12 threeway-split seats to the conservatives, not to mention the places that Labour to UKIP defections would have came back to them as second votes, a replay with the same votes but different rules wouldn't have been a con-ukip coalition government.

Though obviously, if the rules changed then everything would change, new parties, new alliances, less tactical vote buying, more democracy.