Very slim if flying from 16th Dec-15th Jan the a/c used becomes an A343 and prior to this its a 744! But you never no u may jsut be lucky- give exact dates of flying and im sure airchabum will be happy to look it up for u at work!
Again u will need to ask airchabum although im not sure if he can provide exact a/c details till say wed for a 2nd oct dept! But i think that GOA is currently or jsut has been refitted- you will get v:port etc on LHR-HKG!i thinkg!