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.

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’.