I'm finding this whole comment thread a bit hard to read, because this is at least the third Stonehenge special Mike Pearson has done with the BBC at this point

I'm finding this whole comment thread a bit hard to read, because this is at least the third Stonehenge special Mike Pearson has done with the BBC at this point, not to mention plenty of appearances on Time Team. You're pretty spot on - this is a well-known archaeologist with an established record as a television presenter. From what I remember of the previous Stonehenge specials, the filming process appeared to be: academic research team does the excavation for a few months, camera crew comes in when a "big moment" is expected, and also films a rollup where the researchers talk over exciting discoveries made in the past months while they're there. They've been digging near Stonehenge and on associated sites along the river for years and years.