I spent a short time at Lyneham from 1978 to 1979, where I was told the Smiths Autopilot had come from the Valiants.
As for the fuel question, at Brüggen (76-78) the Jaguars were a metric aircraft but the fuel bowser meters were a mixture of lbs, kg, gallons and litres, Murphy had a field day, so some form of standardisation was needed.