The site will be open for the first time in 2021 on Saturday the 3rd of July, but only for three booked tours at 10, 12 and 2. Bookings must be made in advance via the SWHT website and will be free, but donations will be welcome to support the continuing work on the site.
Avalon Archaeology 'Hands on Heritage' 
I am trying to book one of the times but the link takes me to a completely different tour!
Sorry for that. Problem with the SWHT website over the weekend – all working now.