I was an ex V Force AEO
In the 60s and 70s we communicated with HQ Bomber/Strike Command which had the call sign NRU74 - none of us had their own callsigns.
Also, if you needed to use first class Morse it was from MLM which was at Uxbridge.
Pontius N I think 35 wpm is a tad fast - probably 25 wpm max(ish)