BlueUpGood - am an the same shoes as you; not ever being a member of Bassa, although I am a member of Unite.
Bassa have 28 days to comply and until that time has passed, they have done nothing wrong. If they do comply, then no doubt we will all be having the debate on the numbers. If the Bassa branch are paying £50K to its secretary and depending on the detail of the ET, it could be money well spent.