You mean you don't have, somewhere in your lockup, the UK equivalent of a 5-gallon plastic bucket full of weird little-sized plumbing fittings, like the old purge line from the shop compressor you dismantled at Wegley & MacSpunking's Boate Launche House, or something like that? Surely there's a 1/8W BSP back-threaded inverse elbow in there somewhere, in black iron or galvanized iron if not brass. Probably a neat little 50mm long threaded pipe nipple too.
What I'd really like to see would be the return of the giant toaster-shaped MZ tank, and whatever petcock arrangement that had. That tank looked cool with the flat bars.