A British model has described how she was drugged, handcuffed, gagged and put in a bag in the boot of a car by kidnappers who then tried to to sell her as a sex slave in an online auction.

Chloe Ayling, 20, has given a terrifying account of her week-long ordeal after she was drugged with ketamine, taken by balaclava clad men and chained to a chest of drawers in a remote Italian farmhouse.

As she returned to Britain for the first time, Miss Ayling said that she feared for her life "second by second, minute by minute, hour by hour".

Her captors claimed to be part of an online organization called ‘Black Death’ and threatened to sell her on the ‘deep web’ if her agent failed to pay a ransom of $300,000 (£270,000).