From Lasors.....that's if indeed you have a UK License.
Section F (ii) Pilot supervising Co-Pilot Activities.
Column 4 tells you to log this as P2.
and
Column 5 tells you to enter as per Section C.
which is
Enter time as second pilot or Co-Pilot (P2) duties.
The most important thing is what does your company log this as. Probably as nothing in order to get the max out of you....ie 100 hours in 28 days and 900 in one year.
Now if you have an incident and you've logged hours as P2 while supervising the FO, and this brings you over the 100/28 limit.
Just something to think about.....as it may not be restricted by your companies rostering system. And you may find you are flying around illegal.