The Lightning wouldn't have operated as far from land or a tanker as the FG1
Err, that wouldn't be my experience from my (one and only) live Southern Q launch. I found it pretty intimidating being 600nm N of Leuchars on my lonesome at 250ft looking (unsuccessfully) for a Bear with the Victor relaying from FL370. And anyway, I don't think it's quite such a matter of how far from land or a tanker you are as it is how close you are to maximum range when you don't really know where you are...
At one point the Victor decided he'd hit PLE and offered to leave me to get home by myself...fat chance. Yes, I could have shut an engine down to help matters on the way home and stayed for another 15-20 mins, but I wasn't that desperate for a One Bear Badge!
Offset/AA TACAN, Violet Picture and an 80nm scope (albeit extended with second timebase returns) were not much to play with, navigation-wise, and I'm sure there are many more live Q-experienced WIWOLs who scared themselves witless back in the day.