Chris Huhne’s youngest son tried to get his father to admit that he pressured his then wife Vicky Pryce into taking speeding points to save him from a driving ban, it can be revealed for the first time today.

A series of increasingly angry texts from Peter Huhne, then 18, to his father were revealed in court during legal argument which can only now be reported.

In 2011 Peter texted: “We all know that you were driving and you put pressure on Mum. Accept it or face the consequences. You’ve told me that was the case. Or will this be another lie?”

Huhne replied: “I have no intention of sending Mum to Holloway Prison for three months. Dad”

But his son responded: “Are you going to accept your responsibility or do I have to contact the police and tell them what you told me?”

Peter sent his father a stream of foul-mouthed obscenities in the wake of the marriage split and the speeding points row. In one text he tells his father: “I don’t want to speak to you, you disgust me, f**k off.” Huhne then tried to write to his son because he would not speak to him.

The son replied: “You are the most ghastly man I’ve ever known. Does it give you pleasure that you have lost almost all of your friends?” adding: “You just don’t get it.” On Christmas Day, Huhne wished his son “Happy Christmas. I love you” and received the reply “I hate you so f**k off.”

Huhne texted him wishing him good luck with his exams, how much he loved him and later, how proud he was about getting a place in college.

The replies came: “Leave me alone. You have no place in my life and no right to be proud”, then: “It’s irritating you don’t take the hint. You are an autistic piece of s**t. You make me feel sick.” He added: “You don’t think about anyone but yourself. You are a pathetic loser and a joke” and finally: “Don’t text me you fat piece of s**t.”

The court heard that Huhne accepted his son was “extremely distraught” over the marriage split and had broken off his relationship with his father.

Huhne changed his plea to guilty today after receiving Mr Justice Sweeney’s full ruling in which he threw out the MP’s attempt to have the charge dropped.

His barrister John Kelsey-Fry, QC, had argued that Huhne had been a victim of abuse of the legal process and had no case to answer. He claimed that prejudicial pre-trial publicity in the reporting of the speeding points allegations in 2011 had made a fair trial impossible.

Mr Kelsey-Fry attacked the newspapers who broke the speeding points story, the Crown Prosecution Service and the police investigation and described the prosecution’s case against Huhne as “gossamer thin.”

But Mr Justice Sweeney took a different view. He said that the jury should be told that Huhne was the registered owner of the BMW caught speeding while Pryce had her own car, a Volvo.

Huhne had been caught speeding in January and February 2002 and again in February 2003, just a month before the Stansted incident in which he was clocked doing 69mph in a 50mph zone near the M25.

Huhne also admitted that the “usual arrangement” was for him to drive to the airport, park in the free space provided for MEPs and on his return pick up the car and drive home.

Mr Kelsey-Fry submitted that there was “no evidence that Huhne was involved in a crime at all”.

In his ruling released today the judge concluded “in my view the prosecution argument (opposing Huhne’s applications) were clearly correct.”

Days after being caught speeding Huhne was spotted by two police officers using a mobile phone in traffic in the Old Kent Road, the court heard.

This offence took place after the Stansted incident but before the official notification of the speeding arrived at Huhne’s house.

His counsel argued that the mobile phone offence meant Huhne would have been banned from driving anyway so he would have had no motive to force his then-wife to take the speeding penalty points. However, Andrew Edis, QC, pointed out that Huhne would have avoided an even bigger ban by avoiding the speeding charge.