Sabotage.
For evidence of this look at the 767 fleet. The last two, on which I flew, had clearly been subject to horrific acts of wanton sabotage.
As a result, both airframes creaked, groaned and rattled their sad disfigured way across the cruel sea in shambolic, damaged shape. Funnily enough a description of the CC too.
Or they could be just time ex'd and knackered; the airframes that is.
Please, please, be aware that some might see BA as a failing airline that would make the old Aeroflot look good and so wish to see Phoenix London Air emerge from the ruins.
If you are one of the future losers my condolences. the best of luck in what ever is your next endeavor.
God Bless, please inform next of kin.
Sir George Cayley