A member of the Abu Dhabi royal family passed out on a London street after a drugs binge, a court has heard. 

Mahrah Al Nahyan, 32, had been taking cocaine in the days before she was found slumped against railings next to an unconscious man.

She had been looking after a three-year-old child at the time, who was found by a passerby barefooted and playing next to a busy road.

Al Nahyan remained unresponsive for half an hour after police arrived on the scene in west London. 

When she awoke, she is said to have responded erratically, yelling: 'This is not a slaughterhouse, why do you care so much? Why are you so worried?'

She admitted one charge of child neglect at Southwark Crown Court yesterday. 

The court heard she has been undergoing drug addiction treatment at the Priory centre in Woking, Surrey, since the incident in June. 

A video recorded by one onlooker showed Al Nahyan lying on the pavement next to children's toys, including a scooter and a plane.  

She is a member of the ruling royal family in Abu Dhabi through marriage. 

The family – one of the richest and most powerful in the world – is estimated to be worth more than £250billion and holds influence in global investments and oil reserves. 

Rio Pahlavanpour, prosecuting, said the passersby 'noticed the child was unattended, without shoes on the street with a scooter and members of the public intervened as he seemed to be in close proximity to moving traffic'.

He added: 'Upon being woken, she said, "This is not a slaughterhouse, why do you care so much? Why are you so worried?"'

When officers searched her, they found drugs paraphernalia but no illicit substances, The Times reported. 

Stephen Vullo KC, defending, said Al Nahyan has stopped using drugs since entering the Priory in July and showed 'significant remorse and resolve to overcome her addiction'.

He added that his client had not taken any drugs on the day of the offence, but was very tired having taken cocaine in the previous days. 

'The immediate future is she intends to complete all of the steps of a three-month programme which will come to an end at the end of this month,' he said.

'Her plan after that is to rent a property in the Guildford area and become a day patient there, where she will attend Narcotics Anonymous.

'She made a grave mistake that day and she knows it.'

Mr Justice Johnson KC sentenced Al Nahyan to a two-year community order with a rehabilitation requirement.

The judge also fined her £5,000 and ordered her to pay costs of £1,000 after hearing she has an allowance of £8,000 a month. 

He said: 'By leaving [the child] to play barefoot in the street while under the influence of drugs, you showed a recklessness and disregard for [the child’s] safety.

'On one occasion they ran towards the road while chasing a piece of paper until a member of the public contained [the child].

'But for the intervention of strangers there was a serious risk they would be seriously injured or worse. They could have run away, become lost. 

'They could have been taken or harmed by a stranger and could have become distressed seeing you and your friend unconscious in the street.'