The oneworld lounge at LAX was a great experience. Unfortunately, due to a traffic accident on the freeway, I was not able to enjoy more than a good 30 minutes of it.
I had plenty of time at Heathrow waiting for my connection onwards, should probably have checked the spa, never got that far. Well, ought to have something to do next time too.
Have to say though, the BA lounges at T5 are great.