I can't give you the reference, it was what I was told by a PPL examiner. I did have the AOPA book (gave it away to a deserving cause) but I did find several discrepancies between what that said and what the CAA told me at various points. I think that your statement is correct about instrument training if you aren't doing the night rating at the same time as the PPL, but 5 hrs in the hood is required if you are doing the night at the same time.
However, what I can do is tell you what is says in the license which is in front of me...
IX Validity: This license is to be re-issued not later than...
The privileges of this license ... medical certificate.
(blah blah) any member state (blah blah)
Night.
So it's listed in validity, not ratings (which is the next page and says SE Piston (Land)) or national only ratings (which is the following page and presumably would show my IMC rating, if I had one - for some reason they included "microlights" on that page, despite my having a separate license for them things and in any case don't need it according to my understanding of the rules).
G