A married City consultant who slung a drunk 18-year-old woman over his shoulders and carried her to a dark alleyway so that he could rape her has been jailed for eight years.

Sanjay Naker, 28, preyed on the young woman after she was thrown out of the Number One nightclub in London Bridge for being too drunk and unable to stand up.

Despite having a wife of two years at home, PriceWaterhouseCoopers consultant Naker was loitering around a side entrance of the club in the small hours of the morning.

When he spotted that the drunk woman had been left alone, he pounced, putting her over his shoulders to carry her to a nearby alleyway.

As the woman desperately tried to get away, Naker was caught on shocking CCTV footage dragging her towards a filthy corner where he could carry out the attack, on March 11 last year.

As the victim lay semi-conscious on the urine-soaked ground, Naker stripped her from the waist down before raping and sexually assaulting her repeatedly for around 30 minutes.

He was only stopped when a passerby, at 4.45am, saw the half-naked young woman lying unconscious with Naker standing over her zipping up his trousers.

As police and paramedics were called to the scene, Naker took a taxi back to his marital home in Wood Green and later claimed to detectives the woman had been "begging" him for sex.

However, a jury at Inner London crown court on Thursday convicted Naker of three counts of rape, attempted rape, and sexual assault. He was cleared of a further charge of assault by penetration.

In front of his sobbing family who had stayed away for most of his trial, Naker was jailed for eight years and put on the sex offenders' register for life.

Judge Freya Newberry told Naker: "You have a respectable life who had a good future ahead of you, with your background you have a network of caring friends and family.

"If you formed a view that the woman wanted to have sex with you, you were very much mistaken.

"It was quite clear that you decided that you wanted to have sex with her and she had no recollection of what happened but you saw an opportunity.

"It was a mixture of your own desire and arrogance regardless of any intoxication on your part."

The court heard the woman is now anxious and lives a reclusive lifestyle, afraid to get into relationships.

She had spent the evening of the attack drinking vodka and champagne in the VIP area of the club, but was ejected when a bouncer saw how inebriated she was.

She was initially accompanied by a friend outside, but when he left to fetch help Naker was waiting to pounce.

Describing the footage in the moments before the attack, prosecutor Neena Crinnion said: "He has managed to manoeuvre her on to his back, into a piggyback position, and he is off across the road and down towards the passageway.

"The CCTV shows she appears to be slumped over his back, not really maintaining any grip."

At one stage, the women fell from Naker's back and banged her head on the ground, but he then began to drag her along by the arm.

"Even in her drunken state she managed to push him off, fend him off, and start to claw her way along the wall back to where she came from", said Ms Crinnion.

"But Mr Naker gets hold of her and drags her along the walkway. When passers-by come along, he leaves her alone but as soon as they are out of view he goes back to get her."

In his police interview, Naker claimed the woman had "seemed horny" and suggested she had asked for a piggy-back because her feet were hurting.

He said he had been out drinking with work colleagues in the area, and went to the club but was denied entry.

Asked why he had not told the passer-by that he had sex with the woman, Naker replied he "didn't want to advertise what had happened because he was a married man".

But in the following days, Naker searched online for the definition of rape.

Naker, from Wood Green, denied all the charges against him.