thankyou Jim. Here is an interesting extrac
In 1952 MacColl's play Uranium 235 did so well at Swiss Cottage that it moved to the West End, with such actors as Howard Goorney, George Cooper, Avis Bunnage, and Harry Corbett, who were to set up Theatre Workshop at the derelict Theatre Royal, Stratford East.
Did Ewan ever discuss his plays   with you, jim