I'd suggest the figures at Companies House which are the ones the auditors signed off.
Re-heat - where are all these big A330 orders for then? The very strong rumours amongst those who claim to be in the know in BA are that Airbus are indeed willing to deliver about 10 A330s for virtually peanuts in order to secure orders for A320s for LGW and a few A380s for LHR. The A330s wuld just be a bridging fleet and would be replaced by A350s in due course. Just because Airbus is going through a lean phase doesn't mean a hefty discount isn't available. It costs money to keep an assembly line open with little going through it. The fixed costs are there anyway, might as well make marginal profit on building something, especially if it leads to orders for another line. Thats the kind of big picture thinking you don't see in BA.