Thanks to Tony Donoghue for pointing out a long forgotten poster and also a cause that was heavily supported by middle class Londoners in the 1930s.
Communism in general and the Spanish Civil War in particular were hot topics of the time.

I can’t help likening the style to Banksy
Tony has done some detective work and tracked down the artist as Norman Weaver, author of this particularly stunning 1940s work for BAOC (among others)

Tony’s tail reminded me of this poster which I owned for a while. Extremely unusual workers symbolism in a UK setting and an unusual artist. A political refugee perhaps ?