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.

Ken Livingstone and David Mellor during the Saturday show on LBC 97.3 Credit: PA

Mellor and the taxi driver, who is not named, started rowing over the quickest route.

I know who I'm talking to and you're nothing. What are you to me? Who are you? You're David Mellor, alright. Cab driver

Mellor is heard telling the cabbie: 'Just drive me there' before launching into a rant.

I've been in the Cabinet. I'm an award winning broadcaster. I'm a Queen's Counsel. You think what? Your experiences are anything compared to mine? Just shut up for Christ's sake. Drive me there. You want to go and keep a civil tongue in your head, ok? I'm not trying to intimidate you, I'm just sick of actually having to sit in the same cab as you. David Mellor

David Mellor Credit: PA

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.

This man seriously provoked me and ruined a wonderful day. Once I had lost my temper, which I regret, he then secretly recorded me. I will leave the public to judge his actions. David Mellor

David Mellor with his partner Viscountess Cobham at Buckingham Palace Credit: PA

But his outburst was condemned by the leader of the RMT union.