This is an odd concept. Seems very American. I don't think 'respect for office' features very highly in British politics, you're supposed to dislike the prime minister regardless of whether he's from the same party as you or not. Things wouldn't be normal if the Conservatives weren't complaining about Cameron or the Labour Party about Blair. I mean, obviously the Prime Minister is the Prime Minister in the sense that nobody is going to unilaterally declare themselves citizen of independent state of Fuck David Cameron, but disliking the prime minister is as close to compulsory as it gets.