What does this button do.
On the way back to the UK - yes, but via Singapore.
At a rough guess the take off weight would have been just over 300 tonnes (175 basic weight + 30 pax + 90 fuel + maybe some cargo). Max Landing weight is 285 tonnes, so not much above and in any case when there is a possible fire you don't really care about the weight, you get in back to a suitable runway ASAP.
Sounds to me like the boys done well - congratulations.
Top Bunk
(ex BA744P2)