LAX-LHR
I hope the EK lounge does not go back to like it was in T2 before the move to T1. Grubby little room round the back as I recall. Current one in my view is one of the better ones on EK route network, with good views and pleasant staff. T3 BA lounge was good back in the day, but have not used it or BA for sometime so could not comment now. SQ ok, but not as good as EK in my opinion as are others in T2.
I agree with your comments re family room and on arrival lounge, though I do not think MAN has that many flights yet where this would be of interest, though could well be wrong on this.
Kind regards
Mr Mac