Also of interest are the Nightwatch planes for use as mobile command posts in the event of a nuclear strike. They are able to trail a 5 mile long cable to act as a massive transmitter to also contact submerged ballistic missile submarines.
[1] https://en.wikipedia.org/wiki/AN/DRC-8_Emergency_Rocket_Comm...
https://en.wikipedia.org/wiki/Letters_of_last_resort
Maybe "if you definitively learn that the Russians nuked London and WA DC, nuke the Russians"
One also must wonder what the submarine commanders thought of receiving new letters from the new Prime Minister after only 44 day of Liz Truss. If she even had time to write the letters and give them to the MOD.
https://www.globalsecurity.org/wmd/world/russia/tu-95-varian...
The BBC like to get all excited about these aircraft when they do a fly past in international airspace:
https://www.bbc.co.uk/news/uk-scotland-north-east-orkney-she...