Tests on spy's body draw blank

Tests on the body of MI6 spy Gareth Williams have revealed no traces of any foreign substances that may have led to his death.

No evidence of drugs, alcohol or poisons were found during a battery of tests conducted by toxicologists, sources close to the inquiry said.

The 30-year-old GCHQ code-breaker’s naked and decomposing body was found in a padlocked holdall in the bath of his Pimlico flat on August 23.

The mysterious circumstances of Mr Williams' death sparked an international frenzy of speculation earlier this year.

Scotland Yard detectives have been hunting for a man and a woman seen calling at the communal door of his Alderney Street home.

Witnesses said the Mediterranean couple, aged in their 20s, were let into the property late on an evening in June or July.

Mr Williams’ body was found by officers who called at his flat after colleagues raised the alarm that he had not been seen for some time.

There was no sign of any forced entry to the property or a disturbance inside and nothing is believed to be missing.

He was found unclothed, in a zipped and padlocked red North Face holdall in an empty bath in the ensuite bathroom.

A first post mortem examination could not identify a cause of death and police sent off numerous intimate samples for further tests.

Mr Williams, of Anglesey, North Wales, was last seen alive on August 15, eight days before he was found dead.

The cycling fanatic was on a one year secondment to MI6, based in nearby Vauxhall Cross, from his work at the GCHQ listening post in Cheltenham.

His family have lashed out at rumours the mathematics prodigy was involved in risky sexual practices, saying they had been “very distressing”.