The Bowes Museum, Barnard Castle, County Durham. Impossible to describe! Just go there if you’re in the region.
Other ellys: https://www.thebowesmuseum.org.uk/
Besides all the other objets d’art, there’s also a famous automaton,’The Silver Swan’, dating from ~1770 IIRC,
& which can be seen in many Youtube videos. It’s demonstrated every day at 2 pm.