No Sale
Episode: 4x01 | Airdate: Apr 8, 1976
Episodes
Top Hat and Tails
Episode: 4x02 | Airdate: Apr 15, 1976
Forward Mr. Grainger
Episode: 4x03 | Airdate: Apr 22, 1976
Fire Practice
Episode: 4x04 | Airdate: Apr 29, 1976
Fifty Years On
Episode: 4x05 | Airdate: May 6, 1976
Oh What a Tangled Web
Episode: 4x06 | Airdate: May 13, 1976
The Father Christmas Affair
Episode: 4x07 | Airdate: Dec 24, 1976