As a civilian viewer, I thought the bereaved family focus was gratuitous, whistleblower comments (spoken by an actor) revealing and the prog quickly focused on the refueling pipework as the likely suspect
IFR was never in the original airframe design; the 1982 'Falklands mod' was a Woodford achievement in the time available, IMO comparable to Apollo 13
Didn't HMG consider buying US AWACs before deciding on new Nimrod airframes & upgraded electronics?
Temp changes (stress) in current theatre of operations may be significant on fuel line seals (Challenger O rings spring to mind)
At what transfer pressure is IFR conducted?
I suggest that this topic was more appropriate to Air Crash Investigations than Panorama
As for Predator, the RAF may want to commandeer the ASBO drones from Merseyside Police as a cost-saving measure