My immediate thought was also 'erm, how many bedrooms does a stately home have?' Even given that many rooms presumably aren't habitable, where did Jill sleep, for example, when she lived there?
Lewis lived there. So did Julia at one point. So there must be other rooms. Surely putting him in Freddie's room is just ridiculous?
(Re. Gwen John. A quick google reveals that in 2013 Sotheby's sold her painting 'The Convalescent' for £250,000. Way above the estimate of £60-80,000. So Russ must have been thinking he was well in with a wealthy, beautiful, naive, young and trusting girlfriend. Which person will crack first? Lily's clearly starting to have the first stirrings of doubt, and about time too)