Dave 89 , I live on one side of M6 in Solihull MBC , directly on the other side on the Birmingham Road to Coleshill the cemetery on the left is Birmingham (we had to pay them for as grave there a few years ago), then everything towards Coleshill is North Warwickshire.
The programme was recorded quite a while ago as the derelict building nearby was demolished weeks ago and the large building seen boarded up on the other side of the road is no longer there.
As they are taking such care to uncover the ancient building perhaps it will be of such interest that they will save it, fingers crossed. They are still working very hard there , I saw them on Friday.
As for finding the musket balls , people in Coleshill and surrounds have been finding them for years now , especially by the river and on the way to Maxstoke Castle which is about 3 miles away and came under fire from Oliver Cromwell and whose gatehouse is identical to the one at Coleshill that the historian drew last night.