A knife-wielding robber has held up a London Colney betting shop for a large amount of cash during a night time raid. 

Hertfordshire Constabulary was called at 5.45pm on Saturday to Ladbrokes in High Street.

The offender approached the counter and showed a member of staff a knife before demanding they hand over money.

The offender took a large amount of money before leaving the shop in the direction of Kings Road.

No-one was injured during the incident.

The suspect is described as a white man aged between 30 and 40 years old who was of a medium build and who had short brown hair.

He was wearing a blacked hooded puffer jacket with the hood up, a white t-shirt and blue trousers.

Call police on the 101 enquiry line with any information quoting crime reference number F3/14/1472.