Season 4

1. Theory

The No. 11 District squad has just completed a rearrangement of their Headquarters accommodation, taking over the house next door to provide extra space; and to bring Gilbert and Barlow into closer proximity with Watt and his team.

1968-09-12 • 50 min

2. Proof

1968-09-19 • 50 min

3. Bird Of Passage

1968-09-26 • 50 min

4. See The Rabbit

1968-10-03 • 50 min

5. Take Them In Singles

1968-10-10 • 50 min

6. Red Herring

1968-10-17 • 50 min

7. Five Pairs O' Hands

1968-10-24 • 50 min

8. Minor Incident

1968-10-31 • 50 min

9. An Old Song

1968-11-07 • 50 min

10. Big Boats, Little Boats

1968-11-14 • 50 min

11. For A Rainy Day

1968-11-21 • 50 min

12. Assistance

1968-11-28 • 50 min

13. Equal Status

1968-12-05 • 50 min

14. Obstruction

1968-12-12 • 50 min

15. Going Quietly

1968-12-19 • 50 min

16. On Christmas Day In The Morning

1968-12-27 • 50 min

17. Departure

1969-01-02 • 50 min

18. Cross Reference

1969-01-09 • 50 min

19. Run For The Hills

1969-01-16 • 50 min

20. Pressure

1969-01-23 • 50 min

21. A Quantity Of Gelignite

1969-01-30 • 50 min

22. Critical Path

1969-02-06 • 50 min

23. Persistence

1969-02-13 • 50 min

24. Second Chance

1969-02-20 • 50 min

25. How's The Wife Then ?

1969-02-27 • 50 min

26. Right To Search

1969-03-06 • 50 min

27. Proved Connection

1969-03-13 • 50 min