That's interesting. The Spanish definitely say their PPL on-line theory exams, which are the only ones acceptable for a Spanish licence, come from the ECQB.
On the other hand the Poles are clear that theirs do not.
Exams for CPL (A) / (As) / (H) pilot license an airline transport pilot ATPL (A) / (H), a multi-crew pilot MPL and IR (A) / (As) / (H) rating will be provided in English, based on the European Central Question Bank O1.
Exams for private pilot license PPL (A) / (As) / (H) glider pilot SPL, balloon pilot BPL, recreational pilot LAPL (A) / (H) / (S) / (B) will be held in Polish based on the National Question Bank. PPL (A) exam is available in English.
I suspect the JAA CBQ and the ECQB include a lot of material from the UK nation question bank anyway.