Robbers raided a jewellers, threatening staff with a knife, and stole expensive watches.

Three men forced their way into Henley Goldsmiths in Duke Street, Henley, at about 3pm on Wednesday.

When the staff came out of the back office into the shop, one of the men pointed a knife at a member of staff and told them to get into the office.

The men stole Rolex and Cartier watches worth about £50,000.

They left the shop and got into a silver BMW 3 series convertible, two-door, with a black roof, registered J4 HER, which had been parked in a lay-by opposite the shop.

The car drove quickly off into Hart Street and then in the direction of Maidenhead.

The driver is white, with tanned skin and aged in his 30s. He is about 6ft tall, stocky, with short black untidy curly hair, has a large nose and was wearing a leather jacket and vertically stripped black-and-blue top.

The second man is white, very pale spotty skin, aged in his late 20s to early 30s, skinny, 6ft 2in tall, with light brown or ginger hair in a crew cut. He was wearing a light grey tracksuit top.

The third man is described as white.

Det Sgt Alan Clements said: "This is a very serious offence. The staff have been threatened with a knife but were luckily not injured.

"I believe the men drove around Henley, and parked up in Greys Road while they walked around the area for about 15 minutes before they robbed the jewellers.

"I urge anyone who may have seen these men park the car or walk around the town to contact me. The car is easily identifiable and I hope that someone might recognise the description, or see the car and contact the police."

Anyone with information should call police on 08458 505505 or speak anonymously to Crimestoppers on 0800 555 111.