I think Cranwell was a Valiant dispersal. We were there in 1966 for Exercise Unison. We used the 'old' dispersal buildings and on the wall was a box, unplugged, that looked like the standard 'bomber' box connected to the bunker at High Wycombe.
In the mid 70's Cranwell was a planned dispersal airfield for a USAF detachment. IIRC the op order called for support of up to 6 x F4s. I seem to remember that this task was cancelled before 1980.
YS