It's all in JAR-FCL 1, which can be found
here.
To quote:
JAR–FCL 1.110 Privileges and conditions
(a) Privileges. Subject to any other
conditions specified in JARs, the privileges of
the holder of a PPL(A) are to act, but not for
remuneration, as pilot-in-command or co-pilot of
any aeroplane engaged in non-revenue flights.
But before you all book yourself on a type rating for the A380, read section F of JAR-FCL first which lists the hurdles to take before you can do so.