Health and safety officials have been checking gas appliances inside the flat to trace a leak, and the apartment block has been evacuated while tests continue.
Again like most rich men, he has lots of houses (two by Lutyens in Britain, a flat in Cannes, a villa in Tuscany and a Park Lane apartment) all lovingly described by the investigating teams.
For example, a major terrorist attack in London was disrupted last year when a grandmother noticed a group of young men frequenting a flat that contained no furniture and then detected a strange chemical smell wafting from the apartment.