Thanks for the replies ... all VG.
Interesting that the police were checking Communist cells during the general strike. I didn't know that the latter were so organised.
Also, thanks to Bob Hughes for his input. Did your father tell you how things worked out in practice? I mean, was it a normal police car or some kind of van? Was the gear just plonked down on the rear seat? Or perhaps it was a point to point link between police stations.
I have heard that in the 1930s someone on the south coast was picking up the Edinburgh police.
All good stuff and thanks again.