Amazingly enough, it wasn’t any of those. It was this one:
http://www.espn.com/30for30/film?page=hillsborough
I thought it was excellent, although I was completely unfamiliar with it before this, so I can’t speak to its accuracy.
I think that’s the top one listed mate (I should have labelled it clearer) - by Dan Gordon for ESPN’s 30 for 30.
It couldn’t be shown in the UK (officially - cough 😉) whilst the Inquests were ongoing as to no prejudice them, and was eventually shown a couple of years later - with an updated version released in May 2016 - to include additional footage and the verdicts of the Inquests.
The whole 30 for 30 series is a cracking watch - I’m not up on US sports but found some of those fascinating, especially the Bets That Never Was, Pony Express, Trojan War, Kings Ransom, Small Potatoes amongst others - as well as The 2 Escobars and Once Were Brothers on a more global scale.