“Stonehenge is always regularly watered - and the only reason these [the holes] have shown up is because - for some reason this year - their hose was too short…”
A 1.5 mile run from the new visitor centre is a bit too much for any hose ;-)
So, the discovery was made by ‘two eagle-eyed members of staff’ and not by the archeos... chuckle :-) Some nice pics (not of the hose) here.