Michael Berkeley 's guest this week is comedy actor Brian Rix , who for many years delighted British audiences with his performances on stage and screen in the famous Whitehall farces. Lord Rix has recently retired as chairman of Mencap, Britain's largest disability charity, after 30 years of vigorous campaigning for the rights of disabled people. His musical choices in this programme reflect aspects of his long and distinguished career. Executive producer Wendy Thompson Repeated tomorrow 6.30pm