Close Co-operation is the 219th episode of The Bill.
A raid led by D.I. Burnside to recover stolen property leads to the discovery of a small-scale drug dealing operation. The dealer is arrested when he gets tripped up by P.C. Hollis in the garden. As Sun Hill's cells are being refurbished, prisoners are being held at Barton Street. Sgt. Penny is stationed there as custody officer.
When Penny finds the drug dealer has been beaten up in his cell, the Barton Street custody sergeant wants to keep things 'in house' and discovers that the constable on duty in custody had lent the cell keys to another sergeant, Terry Coles. Coles freely admits to Penny that he carried out the assault, thinking it will go no further. However, when Sgt. Peters decides to cover his own back and complains on the prisoner's behalf, Penny has to report the incident to the Inspector.
- Eric Richard as Sgt. Cryer
- Roger Leach as Sgt. Penny
- Larry Dann as Sgt. Peters
- Christopher Ellison as D.I. Burnside
- Peter Ellis as Ch. Supt. Brownlow
- Ben Roberts as Ch. Insp. Conway
- Colin Tarrant as Insp. Monroe
- Andrew Mackintosh as D.S. Greig
- Mark Wingett as D.C. Carver
- Graham Cole as P.C. Stamp
- Huw Higginson as P.C. Garfield
- Jeff Stewart as P.C. Hollis
- Vikki Gee-Dare as W.P.C. Ford
- Colin Alldridge as P.C. Young
Philip Whitchurch, who appears as Barton Street's Inspector Twist, would go on to appear in One for the Road, and later portrayed the regular character of Chief Inspector Philip Cato; it is implied from dialogue that Twist and Cato are actually the same character.
Sergeant Terry Coles would later appear in Corkscrew.