Police outside the home of Eva Rausing in Cadogan Place, Belgravia, where she was found dead. Photo: John Stillwell/PA Wire

Tetra Pak heir Hans Kristian Rausing is still not medically fit to be questioned by police about the death of his wife Eva, an inquest heard today.

Police discovered the body of millionairess Mrs Rausing after they arrested her husband over drugs earlier this week, the hearing was told.

Mrs Rausing, one of Britain’s richest women, was found dead in a bedroom of the opulent Cadogan Place house in London’s Belgravia which she shared with Mr Rausing.

Today’s opening of the inquest into Mrs Rausing’s death heard from Detective Inspector Sharon Marman, who told coroner Dr Shirley Radcliffe that Mr Rausing, 49, was stopped on suspicion of driving under the influence of alcohol or drugs on July 9.

Officers found drugs in his car and when they searched the couple’s home they discovered Mrs Rausing’s body.

Mr Rausing was arrested but is currently under medical supervision and detectives have been unable to interview him.

Det Iinsp Marman said officers stopped Mr Rausing’s car in Wandsworth where they searched it and discovered a small amount of drugs.

“Authority was granted to search the home address,” she said.

“And during the course of that search officers discovered the apparently lifeless body of a female in one of the bedrooms.”

She added of the suspect: “He has been arrested on suspicion of her murder and we await notification of when he will be fit to be interviewed.”

A post-mortem examination proved inconclusive and further test results are awaited, the officer added.

There was no comment on how long Mrs Rausing’s body had lain in the five-storey Georgian townhouse.

According to reports it may have been there for several days.

The couple’s previous drug problems have been widely reported.