With good signage, it was easy to find the Qatar Premium Lounge, a very attractive lounge with lovely and attentive staff.
With what you would expect from a 5-star airline that understands service. Numerous comfortable seating areas and a full bistro restaurant with martini bar and beautifully stocked wine "cellar".
I wasn't very hungry and figured I'd eat on the LHR-DOH flight. Opted for a refreshing shower in one of the four attractive showers.