Yes, if passengers just up and leave, the airline will notice, but how will they know the cause of your dissatisfaction? It could be anything.
Only by people feeding back do the crew managers get to find out out about SPECIFIC problems that are causing dissatisfaction to the paying customer. Yes the onboard forms do some of it, but dont necessarily allow for enough detail for investigations to happen and potentially, disciplinary action.
So, for email complaints;
http://http://www.britishairways.com...ent=contact_us
Phone complaints; 0844 493 0 787
Written Complaints;
British Airways
Customer Relations (S506)
PO Box 5619
Sudbury
Suffolk
CO10 2PG
Some advocate addressing complaints to the Chairman or CEO, others might prefer to address them to the Head of the department responsible for the staff involved and he who had most interest in sorting out non performing CC ... for crew that would be Bill Francis.
BAATW