Red Barron - You underline my point very well. When I was serving in the RAF my 1250 (ID) was accepted not only as proof of who I was but also as an emergency cheque guarantee card. I would be most seriously put out if a card that would allow me access to a nuclear facility, which it did, did not allow me to fly.
I accept in present climate that photo ID on aircraft is a must but it seems to be the laziness and arrogance of RYR that drive them to try to dictate rather than compile a list of officially acceptable ID.. I doubt that it is a revenue earner.
Your final sentence echoes my thoughts exactly.