The neck, for one. The maple seemed so much more ornate than the others I’d ever seen. There was discussion online about whether this one appeared in any of the books (the Barry Matthews one and the other), and they suggested it hadn’t.
Refins are always a risk, too.
If I was spending £15k I’d want independent verification from a known vintage guitar dealer or a probable history from original sale.
Maybe that was provided here, if so, happy days!