The BHF Furniture and electrics shop in our town centre is enormous and has a vast array of furniture, from sofas, pouffes, lamps, mirrors to dining tables and beds, as well “white goods” and small electricals.
There seems to be a lot of late 70s/early 80s living room stuff in recent years , really massive sofas etc (I suspect some has come from big hotels) or rather well to do homes.
It is worth bearing in mind that BHF, in particular is a
foundation first and foremost and a very prestigious and wealthy one at that. Oxfam ditto.
Some of their stuff in the clothing shops is imo overpriced but there are premises to be paid for even if the staff are volunteers.
Smaller charities and local ones can have a bit more say in what they put on sale because they are not dictated to as much and things like “beautiful blue heavy weight velvet curtains” for example, would be snapped up by someone and certainly not torn up for rags. Not everyone wants to be surrounded by the IKEA look and fabric can be turned into other items.
Charity shops are certainly much nicer these days than the old “seedy” ones but many are too “like proper shops” and so have lost much of that Aladdin’s Cave appeal.