Valentin Krzyzyk, 27, is alleged to have lifted up a woman's skirt and grabbed her bottom in the Cirque le Soir nightclub in London

A businessman accused of groping a woman in a nightclub has been cleared after prosecutors failed to disclose CCTV of the complainant carrying on drinking after the alleged assault.

Valentin Krzyzyk, 27, had spent over £6,000 on Dom Perignon with friends at the Cirque Le Soir club in Soho, central London, when he was alleged to have lifted a woman's skirt and grabbed her bottom, on December 20 last year.

The woman, who Mr Krzyzyk is said to have described as a 'thot' or 'table whore', gave evidence claiming she had been hysterical and crying after the alleged incident.

But security footage which showed her continuing to drink with friends was not handed over to the defence team until Monday - months later than it should have been.

Mr Krzyzyk has now been cleared of sexual assault with judge Recorder Michael Bromley-Martin slamming the 'reprehensible' failings of prosecutors over the delay.

He told the jury there had been a 'serious failure on the part of the prosecution to disclose the CCTV' and praised My Krzyzyk's lawyer Narita Bahra for preventing a 'serious risk of injustice' by repeatedly requesting the footage.

It comes as Scotland Yard urgently reviews dozens of sex cases due to go to court after the rape trial of Liam Allan was halted last week and the prosecution of Isaac Itiary, accused of raping a child, collapsed on Tuesday.

Businessman Krzyzyk, who lives a stone's throw from Buckingham Palace, denies inappropriate touching, at Southwark Crown Court

On Thursday, Samuel Armstrong, chief of staff to Conservative MP Craig Mackinlay, claimed he was cleared of raping a woman in his boss's office after 'crucial evidence' was disclosed just days before his trial.

Last week the trial of Mr Allan, 22, was halted at Croydon Crown Court as it was decided there was 'no longer a realistic prospect of conviction'.

Police are understood to have looked at thousands of phone messages when reviewing evidence, but it was not until the prosecution was close to trial that Met officers disclosed messages between the complainant and her friends which cast doubt on the case against Mr Allan.

The CPS offered no evidence against Mr Itiary, who was facing trial at Inner London Crown Court charged with the rape of a child under 16, along with other offences.

He was charged in July, but police only disclosed further 'relevant material' in response to the defence case statement submitted on December 15.

Krzyzyk had been partying with friends at Cirque le Soir when the incident is alleged to have taken place on December 20 last year

Mr Armstrong, 24, was accused of attacking the young parliamentary worker when she fell asleep after a night drinking in the Houses of Parliament.

On Thursday, he wiped tears from his eyes after a jury of seven women and five men found him not guilty of two counts of rape, one of sexual assault and one of assault by penetration, after a two-week trial at Southwark Crown Court.

Mr Armstrong and his lawyers refused to elaborate on what evidence he was referring to, but the court heard the complainant initially refused to give police access to her mobile phone and medical records.

In messages recovered from her phone, she said she had contacted a journalist just hours after the alleged attack to secure a 'sympathetic' write-up, while her medical notes revealed details of a history of mental health issues, including depression and anxiety.