History and other things aside, the RN took up the Walther propulsion after the war with the Explorer class. The submarines were named "Exploder" class because of numerous explosions. Also known as the "blonde" class because in the 1950s h2o2 was mainly used to bleach the hair of Marilyn and the likes.
Actually, according to Wikipedia, the unarmed Explorer class was not thought as a proof of concept, but rather as a "disproof of concept"! The two subs were comissioned to prove they were NOT useful! Imagine serving on a sub build to fail....
Also these were supposed to simulate ASW targets, as many assumed the USSR would start mass producing Walter subs. The USSR AFAIK did never take up Walter engines for submarine propulsion, only for torpedoes. They did build the Quebec class submarines, but these used a closed cycle diesel, not a Walter turbine.
I don't know how the RN did it, but in german service, the H2o2 was to be stored in rubber bladders suspended in the lower part of the vessel. This installation does not sound like it could stand a lot of depth charges.
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