No-one chooses their work positions, they are pre-allocated by a computer system. The CSM then gets the list and allocates the positions using the pre-allocated sheet or changes it to his/her convenience. Some of us will go up to them and ask if we can be changed depending on if they've buddy bidded with a friend and would like to work with them or if they're not happy working in that position depending on experience (it's all up to the CSM to accept or not). No choice really - but we are all happy with that, we have separate Business/First Class flight attendants and Economy flight attendants where they will work in that zone all the time for flights.
This is the same for allocating rosters. We can't bid for our rosters like back at home. The system gives out the rosters then a rostering team goes through them and supposedly has to amend them so we get a fair share of weekends off and varied trips (even though we only do Bangkok, Hong Kong and Singapore plus some charters). Again we don't complain much about it, it's a great base and has the same problems as other companies.
As for the spin team, i don't know what's been happening. I know they've advertised internally for Australian crew back at home in short haul and long haul to apply for the London base, applications will close shortly.