News of the case emerged only when two of Mr Livingstone's colleagues went on a fact-finding mission about noise levels in the West End on Friday and learned that one of the most persistent culprits was the Mayor's adviser. Worst affected was Tanja Howarth, 65, a literary agent who lives above the restaurant. She has recently had surgery for cancer, and is now on holiday to avoid the noise. Mr Bos, 38, said: "I have sat in Mrs Howarth's flat and the noise is like an intrusive hum. She can't go to bed until the restaurant closes."