Here it is in action
This one belongs to ChesterMike. Oh so simple, no heater, no timer no pump. I understand that the design was seen my Charles Colston (Hoover UK managing director) whilst visiting one of the Hoover "boot camps" and is an American design, although not, I believe, by Hoover. Colston brought the design back to the UK and I beleieve that it was origionally planned to be built a Perivale, but WW2 intervened, so it did not appear until 1948.
Mike as postulated, and correctly I believe, that this machine was responsible for completely changing the UK washing machine market as a result of its compact size and low price, where it would fit into the smallest kitchen (typically British) leading to similar sized models from Servis and (rather later) Hotpoint
Al