Found another documentary on P coy on the net. This is one episode of a BBC 7 part documentary on the Parachute regiment. It follows one batch of recruits through parachute regiment training. As far as I can tell, this documentary screened just after the falklands war.
http://www.megaupload.com/?d=A722B3Z8I think this footage is better than the one above because there is more detailed information on P-coy. For eg, we are told that the recruits have to complete a 10 mile (16km) march in 1h 45mins carrying FBO. Seems quite siong and we see 2 recruits suffer from heat exhaustion.
Enjoy.