I don't think there were many ghouls. Undoubtedly some but not in great numbers. Most simply couldn't help it.
The Trident came down just south of the A30, a road I used to use all the time. At that point the road had started to rise in preparation for a railway bridge ahead - although a dual carriageway, there were no laybys and the rise above ground level meant that any parking off the road was difficult. Thus one lane was blocked by emergency vehicles and everything stopped in the other, closely followed by the other carriageway. The view to the south was obscured by trees, so you couldn't see what was going on from a vehicle: over a short space of time the emergency services beat their own paths to the wreckage, so most of the response continued to be via the A30. This was a main route in/out of London - no M25, remember, that arrived a couple of miles away a few years later - so even then the traffic was quite heavy. From the opposite direction (inbound, or eastwards) you were up high enough that the wreckage was visible, although at a distance. The tail was the only recognisable piece: it seemed to be there for some months afterwards. Undamaged electricity cables and pylons virtually overhead bore witness to the steepness of the trajectory.