it is hard to research something when the terms and conditions are so vague.All they know is that they will get a take home pay of at least the net monthly equivalent of £11000 gross.Anything else is for the time being unquantifiable as there are as yet no statistics for what is achievable as flight pay.
I understand what you are saying but, as I did many years ago when applying for a position with BA, there is always the opportunity to ask at interview what the average renumeration will be including the bracketed variable (which came in later!). If the managers don't know then they need to find out as that is going to be one of the major factors that influence a decision.
It makes me chuckle when you see posts on the BASSA forum crowing that the entire wage bill for a New Fleet crew going to Narita would be less than just the allowances under the old scheme!
And still they wonder why the majority of the company wouldn't back them?