Danny,
Can I join the long list of Pruners to congratulate you on your fascinating historical blog, which is an essential read every time I log on. In particular I love your humorous descriptions, which remind me a lot of the great PG’s sublime style.
About CR/CA DF: was it not true that CRDF (Cathode Ray Direction Finding) was the initial version, used for VHF, while CADF (Commutated Antenna Direction Finding) was used for UHF? I’m not sure when UHF became the primary radio, but it was certainly in military jets in the early 60s when I trained.
I’m looking forward to hearing about your time at Leeming: I was there as a QFI 1967-70.