Seconded. Awesome lounge. Much, MUCH better than the over-rated premium terminal. Great service. Sandor, the barman at the Martini bar, will pretty much make you any cocktail you like - and he makes a mean espresso martini
I don't think the QR LHR lounge is a OW lounge, as they send even their own elites to another lounge... for a start, it's not big enough, as I presume it pre-dates the decision to join OW. Whether you agree or disagree, it certainly makes the lounge much nicer for fare-paying QR F and J pax
Anyway, the MH lounge is also not-too-shabby, has nice chilled Laurent Perrier on tap, and is, IMHO, also far better than the current apology-for-a-lounge they have in KUL
You had time to lounge hop?! Man, you get to the airport far too early...