This discussion with Robin Heath on the programme is quite interesting and well with listening to.
https://youtu.be/YLZSiM5fZt8
This must be some sort of a record even for Stonehenge - yet another theory!! https://www.express.co.uk/news/uk/1401630/stonehenge-neolithic-farmers-wales-salisbury-wiltshire-bbc-archaeology-news-spt