The CAA is QUITE clear on this matter.
If you log PIC US apart from a flight test with a JAA exmainer you MUST have a prior agreement with the CAA. The position of logging it and letting the CAA query it goes againt common sense.
American Airlines Captain has 747 on his FAA ATPL (ATP) wants to apply for a CAA PPL do his 747 hours not count ???
Well not exactly. as he is type rated on a 747 he must still meet the requirements for what one presume is an SEP class rating on his JAR PPL. The 747 is definitely not SEP so...
FOr me it comes down to responsibility. If Im observing you...and Im going to be held accountable if anything goes wrong...Ill generally say Im P1 and you are PUT (whether you like that or not is up to you)...unles Im feeeling very genourous and I dont log the time at all - in which case assuming you are legal for pax Ill let you log P1....very rare I have to say.