Sick Squid,
The problem seems not with UK airlines...but foreign aircarriers.
First started flying into LHR in the mid-seventies, and along the line somewhere (a long time ago) the extra 20 minutes fuel notam was distributed.
Not all that long ago, when long range ops from SE Asia started, several aircraft landed with nothing short of fumes remaining, having flown over many enroute alternates prior to arrival.
I ask you, is this sound policy? And if it is not...about time the UK CAA came down hard on operators that have recurring fuel problems.