Great stay overall.
The staff were very professional and friendly. Someone was on reception when I arrived in the evening at c.8.30pm, contrary to what was said in the the note I received from Hotels.com prior (i.e. that reception closes at 7.30pm). There is plenty of free on-site parking, which was convenient.
The building is beautiful, nicely maintained and the setting is quite special, in the countryside and beside the Derwent River.
If I had a criticism of sorts, it would be that the interior of my room (one of the cottages) felt a bit dated, i.e. the curtains, furniture, carpet, paint on the walls / woodwork.
Breakfast was tasty, nicely cooked and presented. The dining room comfortable and well presented.
In summary, I would certainly stay here again and recommend, but do suggest that that the interior should be updated where needed.