The woman was seen with her underwear around her ankles after enjoying a boozy lunch with Graeme Stening, 53 (pictured)

A barrister who had sex with a City solicitor outside London's Waterloo station has had her criminal record cleared after claiming she was too drunk to consent.

The woman was seen with her underwear around her ankles by commuters during rush hour after enjoying a boozy lunch with Graeme Stening, 53.

The pair admitted outraging public decency shortly after their arrest, however six weeks later the woman claimed she could not remember the act as she was drunk.

By claiming she could not give consent the middle-aged woman was given lifelong anonymity as an alleged victim of sexual assault.

Mr Stening, a father of three who lives in a £2million home in Windlesham, Surrey, was investigated for eight months by police following the woman's claims.

The barrister had appealed the decision by police not to prosecute Mr Stening over sexual offences due to a lack of evidence, but the ruling was upheld.

Scotland Yard confirmed that the woman's caution for outraging public decency had been 'expunged' from her record, The Times reported.

Mr Stening, however, accepted his caution for the incident, in which he and the barrister were spotted in an amorous embrace in August 2015.

They ended up so drunk they were found by police at 7pm leaning on a wall outside Waterloo.

After both were held overnight in the cells, the woman QC - who cannot be named for legal reasons - accepted a police caution for outraging public decency.

Along with being a leading lawyer herself, she had legal advice before signing the caution – in which a suspect admits a criminal offence and accepts a police warning without going to court.

Mr Stening refused to do so and faced trial, meaning the female barrister would have been named publicly in court.

But six weeks later, the woman tried to retract her admission, claiming the caution had been ‘administered erroneously’ because she was too drunk to consent to sex.

The pair ended up so drunk they were found by police at 7pm leaning on a wall outside Waterloo (pictured)

This gave her lifetime anonymity as a potential sex assault victim. Amarjit Bhachu, Mr Stening’s solicitor, claimed the woman made the claim in order to prevent her identity from being revealed.

Mr Stening was then interviewed about the new claims under caution and his trial was delayed while a charging decision was made.

Eventually, he was not charged with sexual assault after police found two witnesses who said she was a willing partner in the drunken romp.

But, as a result of the allegations, he spent months in fear of prosecution.

Stening, whose wife Sian was standing by him as of last summer's hearings, works as general counsel at multi-billion pound private equity firm Doughty Hanson.

The venture capitalists buy and develop market-leading businesses throughout Europe.

He previously worked as Vice President and Group Senior Counsel of Invensys during a successful career as a corporate lawyer.

The Daily Mail can reveal that the Solicitors Regulation Authority decided no further professional disciplinary action should be taken against him.

A Met Police spokesman said last night the QC’s caution had been withdrawn, or ‘expunged’, after one of the most senior officers in the force became involved.

The spokesman said: ‘The woman’s caution was expunged on April 20. The caution was expunged on the authority of Deputy Assistant Commissioner Richard Martin.

‘DAC Martin was not satisfied the full criteria for the original caution were met. Therefore it was expunged.’

When the prosecution of Mr Stening was finally dropped last June, a source said: ‘There is now independent evidence from witnesses, it seems, who saw what an active participant she was in this “romp”.

‘I can’t believe the police will accept her attempt to withdraw her acceptance of the caution.

‘If her attempt were to be successful, she would surely have to be charged with outraging public decency – and appear in court after all.’

The Bar Standards Board refused to comment on the woman’s case.