I think you have that bit wrong Craig. Upset ailerons do NOT "spoil" and cause the airflow to break down as do proper flight spoilers. They, upset ailerons, reduce the mean camber of the aerofoil, retaining normal laminar flow thus reducing the CL for a given A of A.

On the VC10 (long since out of service with BA but still used by the RAF as tankers) we used aileron upset (both about 5 degrees up) at weights above 131 tons to reduce lift on the outer wing to provide wing bending relief once flaps and slats were retracted, the airflow remained, as always on the VC10, smooth as silk.

Other than that you and Highhorse have it spot on !

Regards,