Lack of a fire is interesting.
He spent half an hour wandering around the countryside after arriving near the airport. If he did not add fuel at his intermediate , unscheduled stop, and originally departed with an hour of reserves, those two unplanned events may have totaled up to all his reserve fuel.
As previously pointed out by others, the original plan called for a daylight arrival.
Had the airport fitted him into the flow for the long runway, the heavy traffic would have been delayed a small amount, but since they elected to send him to the second class runway, they had to close the whole airport for a short time. They lost that gamble. The Doctor should have insisted on the main runway, and accepted minor vectoring to fit the stream of traffic.
I have accepted a "Slow 360, half standard rate, turn left" to let a heavy pass me and rejoin the ILS far enough behind him that wake turbulence would have sunk safely from the path. I was just outside the OM when this request was made.