Rag your Wiki page gives the original name as The National War Museum.
I recalled it as The British War Museum.
Sorry for the slight but irrelevant error.

Jim, the word "imperial" was appropriate because it was not just a British fight. The whole Empire was involved.
Britain was not fighting an "imperial war" as you claim, but was fighting to defend Britain and Europe from an aggressive invader.

Britain was not fighting for territory, only defending.