Osborne sought advice from the government’s advisory committee on business appointments before confirming his registration with Washington Speakers Bureau.

The committee has given him permission to go ahead as long as he leaves a three-month window after his final day in ministerial office. This means he can take up speaking engagements from mid October and has the potential to earn up to £50,000 per speaking gig.  

Osborne is not allowed to reveal any privileged information he received when he was Chancellor and for two years from the last day in service he cannot be involved in lobbying the government on behalf of Washington Speakers Bureau or their clients.

Chairman, Angela Browning said: ‘When considering your application the Committee took into account that you had no dealings with the Washington Speakers Bureau while in office and there will be no contact involved with your former department or government more generally.

‘The Committee consulted Treasury, which had no concerns about you registering with the Washington Speakers Bureau and taking up employment as a speaker.’

Osborne expects to work one to two days per month and he has ensured that there will be no conflict of interest with his current role in government.

Former prime ministers, Tony Blair and Gordon Brown are also registered with the Washington Speakers Bureau, and regularly appear on the US speaker circuit.

The advisory committee on business appointments' letter to George Osborne is here.