Re: the option for going to ACAS for those sacked staff. Few things to note.
1) it only covers 'any employee who has been subject to disciplinary action (in connection with the current dispute) by British Airways and whose name appears in the confidential annex' Now my reading of this is that Mr Holley is out of luck as his actions that led to his dismissal are wholly outside the dispute. Moreover, the list is confidential, so the only people who know who is on it are TW and WW. The wider BASSA membership will not be told.
2) ACAS are more about judging whether BA's response was commensurate to the actions of any crew sacked. It won't look at process (which a Tribunal would) and it won't provide for any damages in the event that the individual is held to have been unfairly dismissed. So not the greatest of options
3) Anyone who opts to appeal has to be damned certain that they want the grisly details of whatever they did put on public display. It may be that an arbitrator will determine that BA's actions were in fact very lenient.
4) Anyone who opts for this route is effectively writing off any chance of compensation from BA. The best they will get is possible reinstatement.