It's an interesting one this. On one hand, there's no doubt the picket was intended to intimidate the lorry drivers if not completely make the plant inaccessible. One the other hand, there's no doubt the police were determined to ensure that didn't happen by whatever means possible and they intended a bigger show of force than the NUM could muster and one that was well-prepared for any eventuality. In the light of what's come out about Hillsborough, you'd now take their claim that they were acting in self-defence with a large pinch of salt.
But, unlike Hillsborough, there were no deaths and most of the charges brought by SYP against the pickets were thrown out of court. So I really don't see what purpose a public enquiry would serve. What does bother me though is that SYP, instead of openly and honetly admitting their mistakes back in 1989, were still actively seeking to deflect blame for Hillsborough onto the victims at the new inquests. That whole force clearly needs a good clean out from the top.