i agree with remoak ...except...if you are a student you should not ( even for practice ) do it on your own. PPLs.. possibly, but best leave such things to your flight review when you are with an instructor so that if your technique is wrong he will pick up on it.
dont think the laws of any country make any difference...it is the aircraft manual that will tell you.
i assume you are talking about small aircraft . normally if you check the manual you will find that such things as stalls and spins ( if permitted ) are allowed ONLY IN THE UTILITY CATEGORY...so only the front two seats can be occupied..
but in the first instance...why would you want to stall an aircraft with passengers ( even fellow pilots or students ) in the first place...
...so DO'NT do it...
the dean.