This problem impacts on the family of the pensioners as well as the pensioners themselves.
There is no logical reason why a pension should be frozen in one country and not another. Take Canada and the USA with their currencies vitually at par and prices likewise. One gets an annual increase and the other does not.
In fact the whole freezing policy is undemocratic, unjust and discriminatory against pensioners who have paid their way in life only to be denied in retirement.
The countries affected are basically all Commonwealth Countries ? I guess that they abandoned the Commonwealth for Europe but that does not explain why the USA and the Philippines should benefit for example.
This is a blight on the British and their known sense of fair play as seen by other countries.