Generalised fuel policy for passengers, screaming or otherwise:
Rule 1. You must always be able to land somewhere with 30 minutes fuel remaining in tanks, and that
does not have to be the airfield of departure, and you do not always have to have the fuel to go to, or even need to nominate, an "backup" airfield or even a "backup" runway.....(e.g. Island reserve anyone
)
Rule 2. There is no rule 2
Rule 3. See rule 1..............................
(reckon I get to back to LHR with enough fuel to return to point of departure about..., ohh, 0% of the time.....oh heck they've started screaming again)