Thanks again DFC
My current logbook actually pre-dates JAR-FCL, although I have recently bought a new one that is in accordance with JAR-FCL.
It still does have a column listed "holders operating capacity" and in the instructions for completion offers the following alternatives
PIC - obvious
SPIC - student pilot in command
PICUS- pilot in command under supervison
It does however have the addional columns for PIC, Co-pilot and Dual
Anyway - you have answered my orginal question .... so thanks