HLI
For spfoster:
You've pretty much worked HLI out. No particular special requirements, it was normally associated with 54% CG departures, since that was the norm with high fuel loads.
Contacts were bridged which allowed some of the tanks to operate at a higher level before shut-off. Sounds simple, doesn't it? But it was a pain in the a***.
The tanks were first filled to normal level (this got tank 11 filled) then a metered amount was uplifted with the bridges in place to those tanks with HLI (M2dude will remind me which they were.....I'm guessing 5,6,7,8 and maybe 9&10?????). It could take ages.
It was invariably followed by a taxy with a Pre Take Off Burn Off to get the CG to its correct position, so you now had the problem that you had to burn enough fuel from tanks 1-4 to allow them to be topped up by tanks 5 & 7 to the extent that 5 & 7 could accept fuel from tank 11 to bring the CG fwd to 54%. Because they were so full it could take ages to get 5 & 7 to accept fuel and then any bump or turn would shut them off. So overall you've filled the tanks, presumably because you need the fuel, but because you've done this you have to burn loads of fuel taxying while you get the CG sorted out.
As you guess, it was mainly a LHR-BGI thing, or a JFK with weather problems, and more often than not you gained very little.