No such estimate has been made, either by number of works of art or by value.
It is generally estimated that there are 200 million objects in registered or accredited museums in the UK. It is estimated that, at any one time, approximately 90 per cent. of museum and gallery collections are not on display. There is no separate estimate, either by number or value, solely for works of art in publicly owned galleries.
The occurrence of local authorities selling art from their museums and galleries is rare. No central record is kept at national level, but any such sales should have taken place in accordance with disposal policies designed to protect the collection.