They've been replaced because they have no MPs. The FDP moved from being a centre party to an, economically, far right one. They're liberal in the classical sense: socially liberal but also in favour of completely free markets. They've also been dogged by infighting in the last few years which...
Several times: there was Grenville's Ministry of All The Talents in the early 19th century, there were the National Governments for both the world wars and there was the National Government of 1931 when MacDonald's Labour government invited Tories and Liberals to serve in the cabinet to restore...
Plenty of people have mentioned that the last Labour government didn't exactly screw up the economy but it's worth pointing out that Labour have got a decent record on the economy. I gave chapter and verse on this a few months ago, on another thread and I can't be bothered to go into it again...