Rupertnav, Waddington is also capable of handling B52. And the electrical power issue was one of the key reasons why the RAF did not take on BTW/Woodbridge - the domestic power supply was, as you point out, dealt with via individual transformers. But the on-base installations were all geared to the US system, all the power outlets were US-style and much of the technical accommodation would have required re-wiring to meet UK standards. The cost of doing this was a significant factor in the business case.