I don't want to discuss the necessity nor the value of a CSD on BA's flights but surely a Senior CSD must have been, by definition, working for BA for anything between 10 to 30 years...
Therefore comparing salaires with a more Junior pilot might not be a full acurate mean to do so.
I agree though that pilots should earn more than Cabin Crew but let's remember that times have changed and the old F/Decks and Crew have been replaced by newer terms which has affected both categories. There is still many people under the old contract in the company so it is no surprise to see some conflict when we try to compare something with what it is no more.
I worked for BA as cabin crew mainline for a short while (less than a year) and my basic salary was £9666 pa (During the year 2000 and no my allowances we not doubling my salary. As a matter of fact I have published a long time ago all my nine months of take home pay in the cabin crew forum).
As far as I am concerned that's a fact I use to judge what cabin crew (BA) take home and if I am all for pilots getting more, rather than taking from others why not fight to improve our conditions and leave others in peace. Looks like it is what has just happened or at least it is my understanding.
All I am saying here is that some perspective is needed, that's all.