We were not asked for birth certificate or passport in his previous nursery and when we enrolled DC in the new place they did not ask for it either, it's just now after of 3 months that they were requesting this. We filled all the paperwork, they reason also is making me suspicious it's the fact that my son has a foreign name and we hold 2 nationalities. One of them being Brit, he was born in the UK, and that's what we put in his registration paperwork, I would have thought, they can cross references between the birth registrations, date of birth and place of birth to check that DC is qualified for the 15 hrs, but then I think this is far too much to ask from the government lol
I think @chocafrolic may be right regarding this request out of the blue.