Pseud says this:

"It seems to me that if the Coppers stood on equal social status terms with the gentry they would not have been received in the scullery, this being of course the part of a large gentry house where the servants got on with their work."

I hope I made it clear (if not, apologies) that the Copper brothers at that time, whilst not 'upsides of the gentry' as they would have put it, in other words, not friends or close acquaintances, were nevertheless respected and valued employees. As such, they would have met their employer in their daily work to discuss farming and land management matters as well as offering intelligence (if that's the right word) as to the whereabouts of game on the Downs when they were off hunting. There was one exception when Copper family members were admitted specifically to the drawing room (rather than the scullery), and that was when after a day in the field, Steyning Beard, the local squire would invite them in to sing their hunting songs and drink hot punch. Otherwsie, most farm business was conducted through the bailiff's office, whilst milk and produce would've been delivered to the 'back door' of 'Challoner's' farm house.