Ancient Observer,
You have hit upon the big problem for BA, it is not like most companies because the workforce are spread all over the world and report at different times of the day.
The managers do try and phone crew at home ( but I have to say that many crew will not take their call) and walk-in sessions are open for crew to chat to managers, in fact at this moment, but hardly any will go in and talk.
Most main crew and a large proportions of WW pursers do not even know who their manager is because our working life is predominantly on an aircraft. Crew arrive just before their flight briefing starts and then on their return go straight home, particularily the WW crew.