It may have a humble address, but that is the only humble feature you will find at 10 Castle Street, a stunning Queen Anne mansion that sits in 27 acres of idyllic gardens and parkland. Inside, you discover the re-invention of the English country-house hotel. As tradition demands, it is privately owned and has the feel of home, albeit a deliciously grand one that doubles as a contemporary art gallery. You’ll find an elegant drawing room that opens onto a terrace; Ionic columns in the airy bar; a dining room with French windows that frame garden views; a first-floor, sitting-room bar that has the feel of a gentleman’s club. Outside, the terrace overlooks a fine English garden, with its trim lawns, wild flowers and an avenue of lime trees. Bedrooms have cool colours, chic fabrics, crisp linen and smart bathrooms; some are huge with garden views, a couple are tiny, but good for a night. Don’t miss the food, perhaps Scottish langoustines, haunch of venison, orange and cardamom crème brûlée. There’s a bakery, a smokehouse, a cinema and a kitchen garden, with a spa coming in 2017. Out of this world.