Stay two paces behind me, and don’t sit down anywhere unless I tell you to,” a veteran bedbug exterminator tells me as I follow him into a suspected infested flat in north London.
In his decades on the job, microbiologist David Cain has annihilated swarms of the blood-sucking insects – from £125m superyachts off the Spanish coast, a £5m townhouse in Knightsbridge belonging to a media baron, whom he refuses to identify, and Tudor beds in Hampton Court, as well as London tenements.
