The drama His Master's Voice (Saturday, 2.30pm, Radio 4) stars Rob Brydon as ventriloquist Peter Brough. Back in the 1950s, up to 15 million Britons would tune in regularly to keep up with the adventures of Brough and his sidekick Archie Andrews. The latter was notionally a 14-year-old schoolboy; in fact, he was made of wood and voiced by Brough. For some unaccountable reason, vent acts were big on the radio in those days, but when television arrived, Brough failed to make the transition (the actress Dora Bryan assured him that she couldn't see his lips move, except when Archie was speaking). Most forms of showbusiness have their funny little ways, and the people who owe their fame and fortune to the smartly-tailored log on their knee are more given than most to losing their grip on reality. In the case of Brough, however, it seems his family was also badly affected by their timber breadwinner.