Also surprised at RE doing NQYORK. It might be ok in the Summer months (inbound tourists from ORK to Cornwall) but year-round would be a struggle. EXTORK a better bet I would have thought.
Don't think EXT-London makes sense for anyone. It's an easy drive, and even easier by rail. Why would anyone want to drive to EXT Airport, park car, check in an hour before, one hour flight, collect bags at the other end etc etc etc. More trouble than it's worth.