I was once subject to a CFS check sortie during my time on YUAS at Finningley.....returning to the circuit, we coincided with the Dominie morning wave recovery and the JP recovery resulting in getting one circuit (final landing) in 45minutes circling between 1,000 and 2,000 ft at the whim of ATC...however, most of our flying was at a weekend which tended to avoid the other military traffic!