Researching the history of XH538, the Vulcan our crew used for Double Top Phase 2 and Giant Voice 1979, I discovered that it was once used for dummy Skybolt trials.
It looked pretty daunting carrying 2 missiles - each weighing 5000 kg with a 1.1 MT Red Snow warhead. If I recall correctly, the UK was going to field some 70+ Skybolts....
But then came MacNamara and eventually Polaris - and the RAF lost its strategic nuclear capability, with WE177 considered a 'tactical' weapon. Albeit in -B form, a pretty big one!