David Mellor has apologised after he shouted foul-mouthed abuse at a London cab driver.
The former minister said he was justified for his anger, but lost any respect because of his foul language.
Mr Mellor issued the apology during his LBC radio show and said he "can't" and "won't" defend his actions.
Mellor began the show by telling listeners he was "really, really sorry" and promised to make a "substantial donation" to the Licensed Taxi Drivers Association's Christmas charity appeal.
He said: "I can't think what possessed me to lose it with that cabbie the way I did.
"OK, I had a case but I threw it away by the way I spoke and I'm really, really sorry about that, and I especially want to apologise to you, our listeners, for trying your patience and risking my own credibility with you by speaking the way I did.
"Anyway, it's water for me at the next celebratory lunch, I've definitely made that decision."
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