Rotorspeed,
From my earlier post -
"Generally to others not in the know and especially the desparate media hounds - by the time the EC135 runs out of fuel, over the previous 30 minutes there would be 3 amber warning lights, 2 red warning lights with audio, 2 loudly complaining police air observers and number 2 engine will quit about 2 minutes before number 1 - that's the way the system is designed"
Police ops in Scotland, I believe, are still conducted under CAP 612 as they are not part of NPAS. As such they will have a minimum fuel load above that specified in the RFM. Prior to joining NPAS, our PAOM Pt 2 required a minimum landing fuel of 60kgs by day and 90kgs by night as against the aircraft's limit of 50kgs. For us, at night, it meant we could land with only the first 2 amber captions lit - if the 3rd was on or any red then I would be in the poo. The police crews I fly with know this and none of them would just sit there and say nothing whilst the panel starts to light up.