Surely that is only valid in a multicrew aircraft?
If you can find that statement in LASORS I will agree with you.
Same as P2, you can log P2 in a Cessna 172 but unless it is part of a pre- agreement with the CAA it cannot be counted towards the grant or renewal of a licence or rating.
A lot of people posting on this thread are trying to make the answer what they would like it to be rather than actually reading LASORS.
My AFE logbook claims to be JAR FCL compliant and contains only the headings listed above. I have both the PPL and CPL varieties.
Your log book is not a statutory instrument so therefore has no place in law.