I also remember seeing around 12 C54’s at Upper Heyford around the time they were there. Not sure what they were used for!

Just found this thread. These were the 7th Air Division’s `airline` and all assigned to 3918thCSG/SW at Upper Heyford. They were used primarily to fly Reflex aircrews to/from various cities in Europe where the crews had voted to spend their weeks R&R off alert duty. When not engaged in this they frequently shot missed approaches/touch ‘n go’s at the other SAC bases such as Greenham Common where I noted 9 of them at various times.
Noted over 500 EB/B-47’s on Reflex Action in the UK – great times!