I'd rather he asked and found out than didn't, logged it and got a slapped wrist from the Caa or an examiner.
There will be no slap on the wrist, you can write what you want in the logbook, it's only when he tried to use a bunch of P2 hours for revalidating his SEP, or as hours towards his CPL that he will find his application is rejected, and it will cost him more money to sort it out.
Rather the darwin principle of Aviation Law, it's all written down, and if you can't read it and understand it, then it costs you money in the long run.
Just like the numerous times I've been at the CAA head office waiting at the public counter desk hearing applications being rejected as they waited too long since passing the test to submit the paperwork, and the pass has now expired.
This is all pretty basic stuff, it's beyond me how people can't grasp it
