Thought I would come back and report how it went getting to LHR I went via MSP the flight from Denver was a full flight at 1115 but I was lucky and was able to fly although another non rev who had been there for there earlier flight did not make it onto this one either. The flight from MSP to London was wide open with 70 plus seats only 3available in business so I was not surprised when given a seat that I would not be getting business class. I was given a seat in economy plus and had a choice of three centre seats or two seats by the window. I opted for the two seats . I was happy to be boarding the plane and relieved to finally get in a seat and get some sleep,as the plane door closed and we were being pushed back te stewardess came and asked if I wanted to move to the front in business as two people had not made it onto the flight. That was a nice unexpected surprise , I hope my return journey is as easy as my first trip as a non rev. Again thank you for anyone who helped me in the last week or so