"I was appalled at what I experienced, " Basia Mowiska, a 24-year-old Polish woman who previously worked as a room attendant at two hotels run by the Park Plaza group, told the BBC.

BBC: Exploitation of workers at top hotels

Basia Mowiska, a 24-year-old room attendant from Poland, who had worked for Hotelcare at Park Plaza Riverbank Hotel, said she thought the hotel guests would be horrified if they knew what happened behind the scenes.

BBC: Top hotels rooms 'not properly cleaned'