Recommendations for a luxury countryside hotel within a few hours of London

[Tripideas]

Any recommendations for a luxury spa hotel in the countryside within 2 -3 hrs of London please?

Places I have already looked at:

Heckfield - stayed here once years ago and loved it but would like somewhere new and budget may not stretch this time

South Lodge - stayed there before and the rooms are quite dated

Penny Hill Spa - felt too big

Anywhere else? Would love nice interiors and relaxing atmosphere and not too busy.

budget between £1.5-2k for 2/3 nights

Buxton crescent, it’s changed hands since I went but rooms are gorgeous and walking distance from a lovely French restaurant too

Lucknam Park - straight down the M4. Fantastic tasting menu and a good spa.

I also rate Coworth Park and Estelle Manor (though be prepared for spa entry being an extra fee at the latter, which is painful as the place isn't cheap).

The Newt is absolutely incredible, the spa in particular. Although it may be out of budget if Heckfield is.

Thank you all, lots to consider here!

@PapayaMarmalade is the Newt nicer than Heckfield? Do they add a service charge at the end of your stay like Heckfield does? This really annoyed me about Heckfield but it is so lovely. Heckfield is closer to get to but I have had my eye on the Newt for a while but I also like the look of a few of the others mentioned here too. If I go midweek I might be able to stretch the budget a bit further.