Malcolm Pryce Wrote:Don't worry, my butler has a spare key and has been trained in emergency resuscitation techniques.

Quote:His book Gideon's Spies: Mossad's Secret Warriors became a major documentary for Channel Four that he wrote and narrated: The Spy Machine. It followed three years of research during which he was given unprecedented access to Mossad’s main personnel. The documentary was co-produced by Open Media and Israfilm[2].

Quote:Concern grows over foreign involvement in spy's death

Concern is growing within the intelligence community that the MI6 spy found dead in his London flat may have been the victim of a professional hit by a foreign power.

Sources have told this newspaper that Britain's intelligence services – MI6, MI5 and GCHQ – are liaising closely to establish whether Gareth Williams was targeted by a foreign power.

The 31-year-old was seconded from GCHQ to work on top-secret systems to defend British banks and transport infrastructure from cyber attack and to eavesdrop on terrorist communications

As a result he may have come to the attention of foreign intelligence agencies.

Security service sources suggest that the most likely explanation for Mr Williams's death is still to be found in his private life, but they admit they are not yet certain and are considering a range of explanations.

Some officials are starting to believe the way the killing was carried out – leaving few, if any, immediate clues as to the cause of death – could point to a professionally-carried-out assassination.

Scotland Yard, which is leading the investigation into his death, said: "We're not at the stage where we can pinpoint how Mr Williams died and all avenues in this investigation remain open. We are keeping an open mind."

It is feared that by the time of his death last month Mr Williams's presence in London had become known to foreign spies, despite the fact he was living in a MI6 safe house with an alarm system linking him to nearby MI6 headquarters.

"It would have been part of their brief", said a British intelligence officer.

The 31-year-old maths and computer expert would have been regarded as a valuable asset for his knowledge of the inner-workings of GCHQ, the government's listening post in Cheltenham, and for his work on preventing cyber attacks on the banking and transport infrastructure.

It is understood Mr Williams's job at the time of his death was creating computer defences in the City of London. Williams would have had access to information which other countries would want to obtain.

The intelligence source said: "His job was to defend the banking system on which Britain's banking, commerce and all our public services depend. It was the kind of work that would have made him prime target for recruitment.

"He was also in a position to know about huge money transfers out of the Middle East which were linked to terror groups. It would be priceless data."

One theory being examined is that Mr Williams may have had an approach from a rival agency, and either rebuffed it without informing his superiors or initially agreed to co-operate then got cold feet.

If such an approach had been exposed there would have been severe political and diplomatic repercussions, making it expedient for Mr Williams to be killed.

It can be revealed that Williams had also played an important role in creating signal intelligence equipment, known as sigint, to listen to Taliban communications in Afghanistan.

He had helped in fitting out three Brittan-Norman Islander aircraft with this equipment to be used as airborne-listening stations.

Based at RAF Northolt in West London since 2007 they have flown over selected British cities searching for communications between suspected terrorists.

A key part of the equipment is the wide-band recorders that Mr Williams helped to develop. Each has the capacity to vacuum up continuous mobile phone traffic in a city the size of Bradford.

The "product" is then downloaded to GCHQ where state-of-the-art computers analyse the voices using voice-recognition software.

Mr Williams's knowledge of US intelligence agencies would have also been valuable. He spent several months at Menwith Hill, the secret listening station in Yorkshire used by the United States to intercept coded messages, and Fort Meade in Maryland, the home of the US's National Security Agency.

The death of Mr Williams has puzzled detectives since August 23, when his body was found inside a sports holdall, padlocked from the outside and left in the bath of the safe house where he was staying while on secondment to the service from his employer GCHQ, the government listening post.

There was no evidence of a struggle or a break in at the Pimlico flat and nothing had been stolen.

Although nothing has been discounted the evidence gathered so far suggests it is increasingly unlikely that Mr Williams was the victim of a random attack or a sex game that went wrong.

Pathologists have carried out two post-mortems, but both failed to establish how Mr Williams died, though the examination was complicated by the fact that the body was said to be in an "advanced state of decay".

What is known, however, is that Williams, a cycling enthusiast, had not been shot or stabbed and did not appear to have been strangled.

Scotland Yard say detectives are now awaiting the result of toxicology tests.

These would establish whether Mr Williams was poisoned using a deadly toxin such as strychnine, cyanide or thallium, administered in such a way as to leave no mark visible to the naked eye.

Sources state that Home Office pathologists are also looking for evidence that Mr Williams was smothered to death, a method that can leave no trace and is extremely hard to detect.

Concern about the possible involvement of a foreign agency has increased further following a public appeal issued last week [Monday, September 7] by Scotland Yard detectives, who are taking the lead in the investigation.

Detectives said they were trying to trace a couple Mediterranean appearance, aged between 20 and 30, who visited the house in Pimlico late one night in the weeks before Mr Williams died.

The Yard revealed the couple were the only people who had been seen around the time of his death at the property in Alderney Street not to be accounted for.

Neighbours told police the pair were let in through the communal front door late one evening, in either June or July. It is believed they were visiting Mr Williams and detectives want them to come forward so they can be eliminated from their inquiries.

Police have visited Mr Williams's landlady in Cheltenham, where he lived for 10 years before being seconded to MI6. They asked Jennifer Elliot about his working hours and lifestyle and about any friends or acquaintances who may have visited his lodgings.

Scotland Yard repeated its appeal for the 'Mediterranean couple' on Friday. A spokesman said: "We are still very keen to speak to the pair. They may have useful information."

Mr Williams's family are reportedly unhappy at the lack of progress in the investigation and are said to have demanded the return of his body. Reports say they would like to commission an independent own post-mortem examination into his death.

A source close to the family was reported as saying: "It is becoming very frustrating to get to the bottom of whatever has happened.

"There are just so many things we still don't know. We have made it clear to the police that we want the body back as soon as possible."

However, Dr Paul Knapman, the coroner in charge of the inquest, is reluctant to release the body until pathologists have completed their tests and established the cause of death.

Quote:The 31-year-old maths and computer expert would have been regarded as a valuable asset for his knowledge of the inner-workings of GCHQ, the government's listening post in Cheltenham, and for his work on preventing cyber attacks on the banking and transport infrastructure.

It is understood Mr Williams's job at the time of his death was creating computer defences in the City of London. Williams would have had access to information which other countries would want to obtain.

The intelligence source said: "His job was to defend the banking system on which Britain's banking, commerce and all our public services depend. It was the kind of work that would have made him prime target for recruitment.

"He was also in a position to know about huge money transfers out of the Middle East which were linked to terror groups. It would be priceless data."

One theory being examined is that Mr Williams may have had an approach from a rival agency, and either rebuffed it without informing his superiors or initially agreed to co-operate then got cold feet.

If such an approach had been exposed there would have been severe political and diplomatic repercussions, making it expedient for Mr Williams to be killed.

It can be revealed that Williams had also played an important role in creating signal intelligence equipment, known as sigint, to listen to Taliban communications in Afghanistan.

He had helped in fitting out three Brittan-Norman Islander aircraft with this equipment to be used as airborne-listening stations.