I am grateful for this pointer from Sarah Cove, Art Conservator, Arts Society Accredited Lecturer and Falmouth Member for pointing out his series of films from Philip Mould.
"Each film lasts approx. 15 minutes and they are really excellent. I was recently in touch with Philip regarding a pair of Constable portraits that have recently come to light (one in Cornwall no less) and he was in the middle of filming."
A full list is available there.