New system, large room, low listening level

My first post, and not for me; for my adult daughter. She wants/needs a 2 channel music system. She lives in the UK in a restored Georgian townhouse which was converted and restored into flats 15 years ago.  Very posh. She is on what we would call the 2nd floor, which in the day was probably the main floor of the entire townhouse.  15' ceilings!  Her main living space is 20' x 30', functionally divided into sitting area, kitchen, small dining space and small office.  It is totally an open floor plan.  Curtains on 3 tall windows on the long wall.

The listening position would be about 12' from the speakers which would located along, and close to, the short wall.  Aesthetically, she would prefer floor standing.  For electronics, no more than 2 boxes, maybe zero or one.

Listens entirely to music from the internet: Qobuz, Spotify, radio (Classic FM), etc.

She listens at relatively low levels, perhaps 75 db max.  Musical taste are classical, light jazz.

Would prefer British brands, or at least brands readily available in the UK.

Suggestions, please.

Thanks in advance, Larry