I'm fairly certain that BA will cancel the entire flight (outbound and return) once you don't turn up for the first segment, it's happened to me before. I don't think you can even agree it with them up front as the way they price it means a different price if the Manchester leg isn't included.My wife and daughter have decided to stay in Cheltenham while I fly to Madrid checked driving times easier to go from Heathrow than to drive back to Manchester on the 12th for my flights. So Manchester ba change at Heathrow ba to Madrid what I want to know is if I don’t get the Manchester flight can I still board at Heathrow going or will they scrap the whole outward flight as a non show cheers