I'm going to agree with the many people who have said "entitlement". You do not have the right to anyone else's money unless it is freely given to you. It's one thing to be kept at a subsistence level, and quite another to be paid £30,000 a year, more than the median salary in the country, and to get it all completely tax-free. You have no right to complain when you aren't paid this much.
Also: resistance to change and new ideas. It has kept Britain stagnant for the last 20 years now, it stops both Britain and America from ever enacting proper reforms, and it's the reason people still use the Imperial system.
Professional politics is another big problem. In the words of Sir James Hacker, "you're in government, I'm in politics." The job of a minister is to remain a minister and to make people like him, rather than to actually do anything useful with the country. On the off chance that he does have a good idea, he runs into Problem 2 and goes back to subtly plotting to become party leader.
(Former) Lead Moderator and (Eternal) VGC Detective 
