Hello John,
Nice to know that you are still around. It was the V Force day at Newark Air Museum today, you would have recognised a few old faces.
The North Pole in. Vulcan would have been “challenging”. Grid navigation using MFS or even the later HRS might have been stretching things a bit. I flew with an ex V Force Nav on the Nimrod MR1 who wrote the 18 Gp SOP for high latitude navigation. He was quite pragmatic about it, saying that he would drop a couple of 8 hour buoys in the last polynya he passed northbound whilst he still had good fixing and then start again from them when returning southbound.
A few years later I did go to the Pole from Bodo in a Nimrod, but we had Twin Carousel and Omega. An MR2 followed a couple of weeks later using FIN1012 and Omega. By that time it was relatively straightforward.
YS