Typical UK flying club practice. If you beg, you are given the "POH". But it is the generic manual, it has been carefully made non-specific.
I recall the first 4 seaters I rented. Did the weight and balance, took my passengers flying and then another member said you did use the weighing certificate rather than the example? Of course no one in the flying club had mentioned that the generic POH bore very little resemblance to the aircraft I was actually flying....... Of course the weight certificate was in the maintenance folder - and not made available to any members (apart from those in the 'know').
Older, wiser and much, much less innocent, I have an aircraft with an exceptional C of G envelope - having owned a couple where there were quite a few limitations.
But my experience in the non-weight limited C152 has stood me in good stead!