Squawk 8888 - same over here.
Club rental checks should be dealt with by mutual prior decision (one logs P1, the other doesn't log anything offical. If training is involved or for the JAR biennial, it's p1 for the instructor and p u/t for the payee.
Anyone believing in P1 u/s on instructor rental checks probably hasn't read the relevant CAP lately (or ever). Can't remember which - CAP 53 is my inclination, but i'll ask this audience rather than phone a friend.