Given the timefacts from the report, I just roughly calculated the estimated fuelindication for the main tank.
They took off with around 300kg, after the 35 min first task and transfer to Dalkeith, the indication could have been around 100kg. So on the way westwards ( ~25 min ), the aft fuelpump fell dry and was switched off. When reaching Glasgow area, the trackcircles indicate the possibility of lowspeed/hover attitudes, which could have resulted in switching the fwd pump off, so the remaining 95ltr in the maintank now were unusable without switching the aft pump back on. And there is still the possibility of a false indication of the supplytank content.
skadi