Forgive the ignorance here, this is my first post to Flyertalk. I'm flying First Class to Heathrow on United with a customer. I'm a Red Carpet member and have a 6 hour lay-over in London. Can anyone help me with the best lounge at Heathrow to take my customer to? I'm also flying BMI, so I think that lounge may be an option too? I've heard that the Red Carpet is nothing special in London so I'm looking for something "higher end"...