Who runs the UK?

Rupert Murdoch warned John Major to switch policy on Europe or his papers would not support him, the ex-prime minister has told the Leveson Inquiry.

Sir John recalled the exchange from a private meeting in 1997, which he said he had not spoken about before.

He said he used to joke that “I went swimming in the Thames, left my clothes on the bank and when I came back Mr Blair was wearing them”.

http://www.bbc.co.uk/news/uk-18405629

This brings more deeper questions in mind,

Who runs the government?  Politicians or capitalists?

If its not the politicians, who accounts the capitalists ?