Notlangley
I am BA cc based at LHR worldwide fleet(longhaul)
We would never be rostered to do a trip with the entire crew again as it would not be possible.Some people may have part time,leave or UK request days next so it would not work.
I will check in for a long haul trip and not usually know anyone on the crew.
I can appreciate that this does sound strange to non flyers who have familiarity in their work place.
Crew,both in the cabin and the flight deck,get used to getting on board not even knowing everyone's names.We all know what tasks have to be done before passenger boarding.This is a very busy time so no real chit chat can take place.
Crew have to be able to work in a team of strangers and get the job done.
As far as I am aware most UK airlines work like this as it makes it easier for rostering.