The above is mostly a commentary on BAA rather than BA.
This may be technically correct. But T5 is the "LHR home" for BA. Irrespective of who owns, manages and cleans T5 if I was BA I would ensure that resources and programmes were in place to present the image that I want.
T5 yesterday evening was a disgrace. Why can't BA/BAA see this? And sort it; rocket science it is not!
Oh dear!