Not that we were perfect back then, but there sure seems to be a lot of Brits that didn’t mind being spies.
But then again, it’s not much of a stretch to go from being a supporter of the “Labor” Party to being a Soviet Spy.
And if you look at the Communists here in the USA during the 30s, 40s, 50s, and continuing onto today, there are many who chose to back a dictatorship over a democratic republic. Read the books by Klehr & Haynes and also by Paul Kengor on the American Communist Party and folks like a certain prominent “Democrat” politician’s mentor - Frank Marshall Davis