Two smartly dressed thieves walked into Graf jewellers in New Bond Street last Thursday and threatened staff with handguns. They made off with a huge stash of rings, watches, bracelets and necklaces with a combines value of 65 million USD (just under £40million).

The audacious pair took a female member of staff out onto the street with them, firing a shot before making off in a parked BMW car. They then drove to Dover Street, via Stafford Street, where they ditched the BMW, fired another shot and police believe made off in a silver Mercedes. Police believe there was another car switch in Farm Street.

Det Chief Inspector Pam Mace from the Flying Squad said: “This was a well planned robbery with a number of vehicles used to help the robbers escape. These men are extremely dangerous and fired at least two shots in busy London streets as they made their getaway.

“Someone knows who these men are, they would undoubtedly have spoken about it beforehand or boasted about it afterwards. I would urge anyone who recognises them, knows the whereabouts of the jewellery or has any other information to contact us.”

Police have released descriptions of the two wanted men, and also a CCTV image which they believe shows the two robbers.

Suspect 1 is white, approximately 30 years old, with a slim build, dark hair with a well-combed side parting, light stubble on his face and is 5 ft 10 – 6 ft tall. He was wearing a grey suit, white shirt and tie.

Suspect 2 is black, described as being in his 30s, 6 ft tall, more well built than the first suspect, with very short Afro hair. He was also wearing a grey suit, white shirt and tie.

It is believed both men spoke with London accents.

Anyone with information about this incident is asked to contact Barnes Flying Squad on 020 8247 4804; if you wish to remain anonymous please call Crimestoppers 0800 555 111

Rocha was awarded the British Designer of the Year Award in 1994 and received a CBE from the Queen in 2002.

Find out more at the John Rocha website