Although England is an island, it is NOT an island to which flights are dispatched to with island reserve fuel.
If ANY flight overflies a diversion airfield KNOWING full well that they will be short on arrival, the Commander needs to be booted out of the respective airline, pronto.
No notice, no pension, no hearing...GONE.
Airlines do NOT pay the Commanders the big bucks for such inaction.
IF airlines condone such action, they should be BANNED from the respective country...period.