We still send imperial based tools all over the world,there are still old DeHavilland bi planes flying in New Zealand and Australia,we've sent whitworth and BA sockets or spanners to aviation museums from the UK to USA and railway engine enthusiasts from Darlington to Darjeeling.There are countless examples of British engineering over fifty years old still working or being lovingly restored in the most unlikely places.There once was a 'Great' Britain.Need a Whitworth spanner? They've got 'em.
(Bumped into this site on a Wiki-wander on the topic of the standard threads for microphone stands. Here in the 'States [and mostly up Canada way], you'll find 5/8"-27 UNS; RCA was fond of 1/2" [or was it 3/4'?] water-pipe or conduit thread. The rest of the world, claims the mob-edited encyclopedia, is like as not to be using 1/4 or 3/8 BSW. Since those Whitworth threads are, except for thread profile and angle, twins to the selfsame size of SAE hardware [1/4-20 and 3/8-16], they seemed a little light to me. And what do the Russians use?)