The 747 in BOAC liverie, reg G-BYGC, is due to land at LHR at 9.55am on Monday.
https://twitter.com/British_Airways/status/1096425915226251264
The plane will actually enter service from Tuesday but I don't think the planes are scheduled for that far out so we will have to see for which flight is that.
https://twitter.com/British_Airways/status/1096848243273748481