The point being that in the time it takes a helo to crawl down a PAR against a 30 kt headwind, everything else in the visual pattern has been sent round many, many times. None of the fixed wing types will have been able to fly their cct bashing detail and it subsequently goes in the Auth sheets as a DNCO, requiring a re-fly at great expense!
This is not a new problem. Back in the mid 70s, while on a UAS at Finningley, I was on the reveiving end of a CFS check. I was scheduled to fly an hour GH sortie with the checker including 30 mins in the circuit. The final 30 minutes coincided with a 105 Sqn flt checker; the Dominie wave recovering; a couple of JP formations recovering plus the odd visiting fast jet. The result was a continual climb/descent between 1,000' and 2,000' in the overhead while ATC kept us out of the way. Even by extending the sortie by 15 minutes, we only managed one approach which was to land.