Here’s my 2 shillings worth.

Any hotel in the Savoy group. Sophisticated and impeccable service.(www.savoy-group.co.uk)
->The Savoy/The Cannaught/Claridge’s/The Berkeley/The Connaught/The Lygon Arms<-

Anouska Hempel works absolute magic at Blakes and The Hempel. Both very stylish/chic (www.the-hempel.co.uk).

Most any hotel affiliated with Design Hotels group for high standards and a change of pace (www.designhotels.com)

The Halkin, (www.halkin.co.uk), contemporary and luxurious, great location near Hyde Park corner.

The Halcyon, beautiful, elegant, private, small.

The Hampshire, luxury smallish hotel in to-die-for spot on Leicester Square. Most rooms here are small.

The Ritz, Piccadily, what can we say about this one?

Brown’s Hotel, Mayfair, top drawer.