The Oberon, the Mk 2 was limited to Blue Steel only. Interesting to speculate what would have happened had the Valiant remained as a tanker.
I think the Mk 1 would have disbanded in the same way as the Vulcan. Then the Mk 2, post Blue Steel may have disbanded too. Its wing was much more flexible and subject to fatigue. In training it had been limited to 220kt compared with the Vulcan at 240 and a dash of 350.
In its tanker version it was re winged with a shorter span.