On the radio restoration forum, a gentleman in Newcastle posted this as one of the answers to my thread. I was astonished.
there were also the wartime valves designed to be used in anti-aircraft shells that were assembled at ROF Birtley and of which I have a few examples. They were designed to withstand 40,000G (yes) laterally from an end of life gun barrel.
There was an earlier thread on these about 2 years ago and I believe the leeds valve museum has some samples.
There were about 3 types. a triode, a pentode and a thyratron used to fire the fuse.
I can see how it took a bit of time for some folk to be weaned away from valves.