This applies to several airlines and has been going on some while (5 years)
Cirrus clouds, are you actually acquainted with the detail? It would seem not from the tone of your posting.
dwshimoda: presumably the same for you, as your 'bigger fish to fry' comment also suggests a lack of knowledge of the facts.
It was BA (at the last restructuring) who wanted pilots to have a variable element to their pay and this has an impact on their holiday pay. This has been challenged and won in the tribunal and BA have appealed.
Many readers of this thread will receive holiday pay which is the same as their normal pay. BALPA has asked for the same for its members, that's all.