Originally Posted by
Apriddy4
Last question [maybe]; would they allow an overnight layover? I realize I would be responsible for the hotel, but the plan would be to leave Stornoway and arrive LHR late at night and then take the early flight to DFW the next morning? I realize I can call (and stay on hold forever) to ask these questions with BA; but folks around here are so much more knowledgeable.

Yes, and they'll cover the cost of a hotel and food at Heathrow under right to care, despite what you think. They will tell you they don't if you ask, but you retroclaim and they'll pay up. A reasonable chain hotel is usually fine, Hilton or Radisson and you book it yourself.
Don't do anything hasty - post your plan here and let people check it out. You don't under any circumstances cancel, you essentially list your desired flights and call up with them.