One local night would be no days off and I don't think BA would do that although of course WW cabin crew do do back to back trips (which have no days off in the middle) and I know that pilots can bid to do that also.
And that is why it is so important that cabin crew have a better choice system for rostering, like bidline, that will give a much higher satisfaction level and lower sickness rate.
Most American airlines have bidline for cabin crew. The systems are there and could easily be imported into BA for new cabin crew.
This would mean that MF crew would be better able to tailor their roster regarding days off and an individual choice of the mix of long/shorthaul.
I know that it is often said that bidline is expensive to run. If that is the case why do all american airlines have the system for pilots and cabin crew?