[1] Many details of his activity remain uncertain, but it is known that he became, on 23 February 1940, the second husband of his co-worker Ursula Kuczynski,[2] whose own public profile in English language sources is relatively well rehearsed thanks to her espionage work involving Klaus Fuchs.
At some stage he had been recruited to work as an agent for the Soviet intelligence services, probably by a fellow Communist called Brigite Kuczynski.
The cell was led by Brigitte's better documented sister, Ursula Kuczynski,[2] based in the village of Caux, then a three-hour hike up into the hills behind Lake Geneva.
Ursula Kuczynski took the opportunity to share with Beurton and Foote her critically important and by now formidable radio operating skills.
Foote was known to colleagues at this time under the cover name "Jim" while Len Beurton was operating as "Jack" and sometimes as "John Miller".
[5] Len Buerton himself returned to Britain, traveling via neutral Portugal, in July 1942, using a passport he had obtained from somewhere in the name of "John Miller".
[2] In November 1950 Klaus Fuchs, under interrogation by the British Intelligence Services, identified Ursula Beurton as his contact with the Soviets.
From the end of 1950 till his death in 1997 Leon Beurton lived with his wife in the German Democratic Republic and its successor state, working for some years with the ADN news agency.