Thatcher for setting alarming precedents regarding treatment of the working class and unions.
Blair for foreign policy and military spending which would have been better spent elsewhere.
Major for standing idly while the immigration floodgates opened, cannibalizing the UK and starting a trend of identity-crisis.
You could say the NHS, education, transport, etc etc are all massive slow-moving systems that take years and years and time periods over several governments and establishments to make real change and differences. I will go ahead and boldy say it was the Thatcher administration that ****ed GB over, and all other governments thereafter are still picking up the pieces. Privatization, taxes, treatment of working classes, jobs, immigration, and so on and on. They didn't 'just' start recently.
I would predict that Nu-Labor have just started something very very similair by surrendering the country over to the EU. Our children will pay the price for that.