The Baeder-Meinhof Gang mentioned in the story was a radical and ruthless group of urban guerrillas that operated in Germany during the 60s and 70s.
The verse read by Kavanagh towards the end of the episode is from 'The South Country' by Hilaire Belloc.
The car Peter Foxcott QC (Oliver Ford Davies) is seen driving at 13:55 is a Bentley T2, an upgraded version of the T1 which were produced between 1977-1980. The Bentley T was essentially the same car as the Rolls Royce Silver Shadow, with the T2 corresponding to the Silver Shadow II which were also produced from 1977 through1980.