Boris Johnson has become embroiled in a row with an influential committee who have accused him of failing to explain the government's 'Global Britain' policy, The Telegraph can disclose.

In a letter sent to the foreign secretary, the chairman of the Foreign Affairs Committee said MPs struggled to understand the Foreign and Commonwealth Office's (FCO) reluctance to provide information. It added that Mr Johnson's reluctance "fails to reflect Ministers’ duty to be as open as possible with Parliament".

'Global Britain' was referenced several times by Theresa May in her Davos speech and the FCO now has a dedicated Director General heading up the policy, which has been described variously as an "aspiration", a “concept” and a “strategy”.

However, MPs are understood to be concerned about the contents and the strategy of the policy.