Well, to tackle the thread drift and get back to the OP's question...
As far as I'm concerned, it is the commander's responsibility to ensure that the aircraft is airworthy and compliant with all current rules and regulations, including all the required equipment. As a club, though, I think it's our responsibility to ensure as far as we can that our aircraft when rented to fellow club members has all relevant and required equipment made available. A PLB is now (or on 25th inst) in the same category as the afore-mentioned fire extinguisher and first aid kit.
TOO