At Hilton Glasgow a few months ago I was denied both breakfast and upgrade (as a Diamond). This was because BF is only included if you get an upgrade to the exec floor. No lounge access either because of no upgrade, so therefore no breakfast. I declared that with absolutely no benefits I might as well go to another hotel (maybe silly, but I was furious and spoke from my heart) and they said they will organise something. They had some wine and chocolate sent to my standard room.