Sexual predator Mohamed Al Fayed spied on customers using the changing rooms at Harrods for decades, according to claims made by his former bodyguard.

Speaking in an explosive new book, the security man said there was a 'good chance' that shoppers using the facilities at the Knightsbridge store during his reign were being 'watched' by the serial rapist.

In the Monster of Harrods due to be released on Thursday, the bodyguard known only as Biggie said the store was awash with cameras which also recorded inside the female staff toilets and locker rooms.

'People don't talk about this - there were cameras right up to the entrance and slightly inside the changing rooms used by Harrods customers, which meant if you were in a Harrods changing room during the Fayed era, there was a good chance that he was watching you,' Biggie revealed.

The installation of cameras, as well as bugging telephones, was said to have been ordered by the head of security ex-detective John Macnamara so Al Fayed could keep tabs on and seek out potential victims.