A FS6 resto:
http://www.tuberadio.com/fs6/fs6.html
I read somewhere that AWA fulfilled a contract for FS6 sets for the Indian army - this would explain how some of these sets have turned up in the U.K. And the FS6 was also used by the Chindits in Burma.
Years ago, I used one of these sets to listen to the old Telecom HF telephone system, all sorts of private phone calls could be heard from outback stations.