I have just watched an episode of Digging for Britain (2014, series 3, episode 3, entitled “North”) in which Alice Roberts presented a section about an archaeological dig that had at that time been going on for five years at a large 15th-century hall owned by Sir John Conyers.
Sir John had served both Edward IV and Richard III, was a Knight of the Garter, and carried Richard III’s sceptre at his coronation. Both kings were said to have dined at the hall. He fell from grace under Henry VII because he supported an attempt to topple Henry and replace him with Edward, Earl of Warwick, the imprisoned son of George, Duke of Clarence, brother of both Edward IV and Richard III.
I didn’t hear any actual identification of the site of the dig, and so imagine they didn’t want to invite unwelcome intrusion. Maybe I’m wrong, and I’m prepared to be put right, but all I picked up was that it was in North Yorkshire, and was a vast “feasting” hall (capable of holding upwards of 1000 people) where many artefacts were being found. Maybe it was at Hornby Castle, Yorkshire, which was Sir John Conyers’ main base. But that’s my guesswork.
Anyway, after Bosworth and the attempted coup, the site that became the dig described in 2014 was sacked by Henry VII, using cannon, and set on fire, reducing it to rubble. What I couldn’t quite decide was whether it was just the great hall that suffered this fate.
On the assumption that it was Hornby Castle in North Yorkshire, this webpage gives a lot of archaeological details, going back to 2011. The work there was still ongoing in 2018.