Conservative MP Chris Grayling has been promoted to Secretary of State for Transport by Theresa May, BBC Reports.

Grayling, who has been Leader of the House of Commons since 2015, will oversee Heathrow Expansion and the future of the HS2 rail line.

The vocal Brexiteer, who was Mrs May’s campaign manager in her leadership bid, remained tight lipped as he left Downing Street.

It comes after it emerged Mrs May had made a personal pledge to the former Leader of the House of Commons that she intends to honour the momentous referendum vote by pulling Britain out of the European Union.

Grayling was a staunch campaigner to leave the European Union.

“I got a promise from her [Ms May] that she really meant that Brexit meant Brexit,” he told BBC Radio 4’s Today programme.

He has some familiarity with his new brief, having been the Conservatives’ shadow secretary of state for transport from 2005 to 2007 while Labour was in government.

In 2009 the Independent reported that Mr Grayling had privately voiced concern about the Tories’ opposition to Heathrow expansion.

Mr Grayling, 54, has been MP since 2001 and has held several cabinet and shadow cabinet positions.

The Epsom and Ewell MP is a Cambridge graduate and worked as a journalist before entering politics.