I believe Mr Holley is still an employee of BA, by virtue that his disciplinary is in the appeal stage.
If Mr Holley has been dismissed at the hearing, then he is no longer employed by BA i.e. BA no longer pays his wages.
He will probably appeal to be reinstated i.e get his job back
His appeal will need to contain fresh information in his defence that he did
not have the opportunity to present at the hearing.