My husband and I just had an interesting experience. He is platinum and we were flying business to LHR. We were in our seats waiting for the rest of the plane to board. A man in a suit came up to use and said a name that was not ours. We corrected him and he introduced himself as a concierge and apologized for not escorting us to the plane. I guss they will come looking for you if they don't escort you. It was really strange, because we were the only people he spoke to.