As there's no real link between Glasgow and a fuel issue ...
While out on a cobweb busting bike ride, I realised, having recently completed an OPC, that the problem with a double engine failure in a twin is that you only expect it to be a single engine failure and don't immediately lower the collective! I would guess that by the time it takes to realise both engines have gone, the rrpm has dramatically reduced.
However, that doesn't explain why they both might have failed at the same time.