LISTEN 
The bumbling civil servants scale new heights for Sir Gregory's poster campaign. From 1970
Crime series featuring Michael Gilbert's London-based detective Petrella
4/4 The sleuth investigates when a victim is found chained to a post in the Thames.
First broadcast: 19 Sep 2007
3/4 The inspector tries to protect a Nuremburg Trials judge from an avenging killer.
First broadcast: 18 Sep 2007
2/4 A tip-off leads the inspector to a gym, where his colleague encounters a former tutor.
First broadcast: 17 Sep 2007
1/4 The detective learns even respected police officers can be suspects.
First broadcast: 14 Sep 2007
4/4 The sleuth investigates when a victim is found chained to a post in the Thames.
Sat 17 Dec 2011 04:15 BBC Radio 4 Extra
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