A BRITISH doctor, known for his advice on Radio Three, was found hanging from his tie at his Tsim Sha Tsui flat yesterday. Dr Christopher Lund, who made regular appearances as a medical expert on Radio Three's Saturday morning Ralph Pixton show, is believed to have taken his own life. Dr Lund, 54, was last seen alive yesterday morning. But he failed to turn up for work at his general practice in the Shui Hing building on Nathan Road. A friend went to the flat in the Wai Wah building at 66 Granville Road and found Dr Lund's body. Police said there was no evidence of foul play and they were treating it as a suicide. No note was found. Last night, medical colleagues were shocked to hear the news. ''This is terrible,'' said Dr Jake O'Donovan. ''He loved Hong Kong and he felt that he wanted to help as much as he could ... He was the kindest man you could possibly have known. He was a real carer. ''I heard him on Saturday and he sounded under pressure. He must have been terribly depressed. Why didn't he talk to somebody?'' Wong Siu-mo, the watchman at the block of flats, said: ''I saw the doctor sometime between 7 am and 8 am. He said good morning to me. The next I knew he was being carried out on a stretcher.'' Dr Lund had been in Hong Kong for more than 15 years. He was an associate partner in Anderson and Partners from 1979 until three years ago when he left to set up his own practice. Dr Cameron Gribben, senior partner in Anderson and Partners said: ''I am shocked and horrified that Chris would do anything like this. He was very interested in life.'' Dr Lund was a regular on the Ralph Pixton show after the 9 am news. His last broadcast was on Saturday when he spoke about the cholera outbreak. Dr Lund, who was believed to be single, was a foundation fellow of the Hong Kong College of General Practitioners.