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It was a made to measure frame and this wheel size was the best fit for that frame. My job was merely to build up the wheels and I wasn't really involved in the bike build. The rider herself wouldn't need to consider tyre choices etc. as when the time comes she would simply take it back to the bike builder (Racer Rosa).
Which goes back to my original point. If he wasn't making any attempt to be aero, I wonder why his client would ask for 650C.