The rank structure in the UK is the same as in Australia....
You have:
CSM (Customer Service Manager) which is like a BA CSD.
CSS (Customer Service Supervisor) which is like a BA Purser (but we have only one and is the CSM's deputy).
BFA (Business & First FA) works mostly in First or Business Class.
FA is obvious really.
We don't cross crew, so at the moment you'll work with London based crew only.