Former Cabinet Minister David Mellor has been secretly recorded ranting at a London cabbie, according to The Sun newspaper.
Mellor, who co-presents an LBC radio show with ex-mayor Ken Livingstone, is said to have told the cabbie to 'f*** off'.
The former Conservative MP's tirade was recorded on the cabbie's phone during a journey from Buckingham Palace.
Mellor and the taxi driver, who is not named, started rowing over the quickest route.
Mellor is heard telling the cabbie: 'Just drive me there' before launching into a rant.
Mr Mellor was returning from an investiture ceremony at the palace with his partner Viscountess Cobham. He told The Sun he was provoked by the cabbie who ruined his day.
But his outburst was condemned by the leader of the RMT union.