I know where there is/was one, but the Sgt in charge wouldn't let it go, even when I asked him if he knew what it was for. He told me it was a 'Enfield' tripod, ans I asked which Enfield, he didn't have a clue. I should have had a better look at it but I assume it was a BSA or CCM tripod.
Talking of CCM tripods, they don't appear to be to common in the UK, I only know of a half dozen or so, and those are mostly ex NZA items.