'Final' e mail from BA tonight saying that despite their further investigation and accepting my comments and those of the CSD, the offer of 9000 Avios points is 'fair' and is the final offer they will make.
They are sorry and hope that I will continue to fly with them.
Will I? Probably, but I will at least check out the competition from now on instead of automatically booking BA to fly everywhere.
Thanks for all your comments and banter - even from those who have been somewhat hostile