Good old "DC" was never really an S61N Mk II, she was kind of a Mk 1 and a half. I wonder if you still have to turn off the #2 AC Gen to transmit successfully on the HF as we used to have to do every 15 minutes!! First flew her in 1980 according to my log book. I think she used to be on contract to Mobil and flew constantly to the Beryl A and back, sometimes via Sumburgh.