Not sure which RE fairing SW is thinking of -
Providing it's not an actual RE fairing.
The Airflow wasn't for speed - but gave superb weather protection.
The Sportsflow was typical of the 'dolphin' fairing used for innumerable applications is the 60's.
The Speedflow was identical to the Avon racing fairing - with the controversial 'nose cone' - controversial because you couldn't easily see the racing number through the perspex.
This is the same design that our hosts still sell for a number of models - and a very fine piece of kit it is!
I think the extremely fast Hitchcocks 612 was timed at well over 110mph with this fairing fitted.
All very successful fairings of their type.