Sanjayan Nadarajah is pictured today as he leaves Highbury Corner Magistrates Court

A father-of-two faces jail after he secretly recorded 'upskirt' clips of unsuspecting female commuters on the Tube and posted them to adult websites.

Sanjayan Nadarajah, 43, followed young women wearing short skirts on the London Underground with his phone hidden in his laptop bag.

He also recorded half-naked women trying on clothes in shop changing rooms and took further opportunities to film in airports and shopping centres.

The pharmaceutical consultant, who has a chemistry degree and lives in a £775,000 home Tadworth, Surrey was hunted down by British Transport Police.

Officers discovered the online clips and traced Nadarajah, known as 'MonkeyMan9', when the adult site shared his email address.

At Highbury Corner Magistrates Court, he pleaded guilty to five counts of outraging public decency between May 17 and July 19.

Nadarajah also pleaded guilty to two counts of voyeurism and was released on bail to be sentenced at Blackfriars Crown Court on a future date.

Prosecutor Nikhil Khosla said: 'The BTP learned videos were appearing on an adult site of covert "upskirt" recordings in which the females involved were unaware.

'The person responsible seemed to be using a camera in a bag and on occasion filmed himself.'

There were 57 clips uploaded by Nadarajah under his 'MonkeyMan9' username and all but nine, marked as only available to 'Friends of User', were viewable.

'Some of the clips were recorded in supermarkets and airports and under changing room curtains of females wearing only their underwear,' added Mr Khosla.

Nadarajah, 43, followed young women wearing short skirts on the London Underground with his phone hidden in his laptop bag

During the investigation, eleven more clips were uploaded after Nadarajah filmed up women's skirts on an escalator at Lakeside Shopping Centre.

He was arrested on October 9 and police seized a Samsung phone and two memory cards containing more 'upskirt' recordings.

'These were filmed at close range and Nadarajah could be seen adjusting the camera.

'Examples include a young woman on the Underground wearing a short black and white skirt, who was filmed from behind on an escalator.

'Another was a female sitting opposite the defendant on a tube train, who was wearing a short skirt, who the defendant followed off the train and up stairs filming her buttocks and underwear.

'At a clothing shop in Wimbledon he twice filmed women in changing rooms, with one in full view in just her bra and knickers.'

Nadarajah claimed it was 'a fascination for him to film female's and that 'if they knew they were being recorded they would have felt victimised'.

The prosecution claim the offences fall into Category One for sentencing purposes with a starting point of six months imprisonment.

Magistrate Liz Blake announced: 'These matters are very serious. They do cross the custody threshold. The powers of this court are not sufficient.'