I suspect that depends on your definition of "near" but IMO, of the official airport hotels, the Crowne Plaza is best of the bunch (please ignore the guff that gives the Radisson Edwardian this claim - i've stayed at both twice in the last 12 months and hands down it's the CP )

Smart rooms and good on-site restaurant (Simply Nico, not the one in the lobby). As always you're faced with the dilemma of transport, but if money is no object then i'm sure that can be resolved.

If you're going further afield, then there's Cliveden near Slough. Have never stayed there personally, but I understand it's gone somewhat downhill recently.