A SECURITAS employee questioned colleagues about security measures at a cash depot just months before it was robbed in Britain’s biggest ever heist, the Old Bailey has heard.

Emir Hysenaj, 27, who is said to have been the "inside man" in the Tonbridge depot raid last February, asked staff about the thickness of vault walls and how to open loading bay doors.

It is claimed Hysenaj filmed the inside of the high-security warehouse with a mini camera hidden in his jeans, then played it back to other gang members so they could learn the layout.

Giving evidence this week, Securitas employee Matthew Harmer said: “He asked me things on three separate occasions. The last time was a week before the robbery. We were in the loading bay and he asked why both doors couldn’t be opened together.

“I wasn’t suspicious. Other people had asked questions before. I thought he was just curious.”

Hysenaj allegedly carried out a series of undercover surveillance runs for the gang before the raid.

The court has heard that Securitas boss Colin Dixon, 52, was ambushed on his way home to Herne Bay and forced to stop by two men disguised as police offficers.

He was taken to an isolated farm and forced to reveal security details at gunpoint, while other gang members dressed as policemen went to his home where his wife Lynn, 46, was with his young child.

The court also heard that one of the suspects admitted his car was used to stake out Mr Dixon’s home.

Using a radio news bulletin which could be overheard in the background, police were able to date and time surveillance footage filmed from inside Jetmir Bucpapa’s VW Golf. An officer cross-matched the recording with a news story about supermodel Kate Moss from Invicta FM at 5pm on January 31 last year.

A digital imagery expert who studied the film, taken from a hidden camera inside a bag, was able to compare details with Bucpapa’s Golf, seized from his home.

Expert David Anley said a large crack in the windscreen, stickers and a sat-nav screen all matched.

“There’s a high degree of consistency in the line and placement of the crack and it would amount to a strong case to say we were looking at the same windscreen,” he said.

Stephen Vullo, for Bucpapa, said: “Mr Bucpapa does not dispute his car is the same one as in the video.”

For a second time the jury were shown a recording downloaded from a computer found at the home of suspect Lea Rusha in Lambersart Close, Southborough. The recording allegedly shows a reconnaissance trip to Herne Bay on January 31 last year.

Prosecutor Sir John Nutting QC read a statement of Invicta newsreader Geraldine Cooper, who confirmed her 5pm bulletin was playing in the background.

The car was seized the day after the raid from outside Bucpapa’s home in Hadlow Road, Tonbridge.

Lea Rusha, of Lambersart Close, Southborough; Stuart Royle, of Allen Street, Maidstone; Jetmir Bucpapa, of Hadlow Road, Tonbridge; Roger Coutts, of The Green, Welling; John Fowler, of Chart Hill Road, Staplehurst; Emir Hysenaj, of New Road, Crowborough; and Michelle Hogg, of Brinklow Crescent, Woolwich, have all pleaded not guilty to charges of conspiracy to kidnap, conspiracy to rob and conspiracy to have in their possession a firearm.

A seventh man, Keith Borer, from Hampstead Lane, Yalding, stands accused of dishonestly receiving £6,100 of stolen Securitas money, which he denies.

The trial continues.