One of the many series to have transferred from BBC Radio 4 to BBC TV over the years, this is one of the ones which was better on radio. But, given that the radio show was brilliant, the TV show wasn't too bad.
Back in the Eighties one of the most famous men on British TV was Roger Cook, the consumers' champion, who braved having his head kicked in in order to challenge cowboy tradesmen about the way they'd fleeced members of the public. "David Lander" was Sarchet and Fry's parody of Cook's oeuvre, and pretty well done it was too. It's the kind of material that'll only stretch to one series, so it's been largely forgotten, but it's definitely worth a listen, if not a look.