This is David Lander was a TV show that parodies Roger Cook style door-stepping investigative journalism shows, starring Stephen Fry as David Lander and written by Tony Sarchet.
It began as the BBC Radio 4 show Delve Special, which became this six part Channel 4 series in 1988.
For the 1990 series, Stephen Fry was too busy with other work commitments and the series was re-named This is David Harper with Tony Slattery replacing Fry's character with a minor name-change.