Well that's good news, Conc.
I just believe that there is no good reason why at least one shouldent be kept in the air for display purposes.
BA have been the very fortunate custodians of the type when others have wanted to operate her commercially and been denied - they therefore have a duty to do all that they can to keep this wonderful piece of British history flying, even when they have finished with it for whhatever reason - financial or mechanical.