The MAS series of dangerously low fuel emergencies into Heathrow lead to bare faced denials and cover ups by MAS. UK authorities couldn't rely on assurances given and in the end had to insist that MAS provided weekly reports on fuel levels of aircraft arriving into the UK as a condition of being allowed to fly there.
A bit of a red herring in this case, methinks.
Flights from Malaysia approaching Heathrow with low fuel have been in the air for 8-9 hours, MH370 wasn't long out of KL.