At the 1933 Olympia (London) Cycle Show Brooks displayed advanced technology in saddle construction. I found this article(PDF) in the Nov 24, 1933 edition of Cycling magazine. The Brooks piece was a part of a larger article about highlights of the show.

There are some interesting concepts here for Brooks wonks. I have never seen one of these saddles.

Interesting vocabulary:
“roadfarers” kitbags” “Champion Duralumin” “B.16 Champion” “castalumin formation” “automatic tensioning device” “fabric-cum-leather-cum-felt surfacing” “dome-headed rivet” “Plyflex” “constructional alteration”

Saddlemaker Fi’zi:k illustrates a theory of saddle fit they call  “spine concept. They have neat flash graphics of see-theu riders on bikes. If you are prone to analyzing your interface with the saddle it might be good food for thought. Maybe you can “Find the animal within you.”  Just don’t ask me how it all relates to the Brooks models.

(Fi’zi:k is Brooks’ sister brand)

A lot of customers are frustrated by the length of the clamp area on Brooks saddles. They wish for more setback.

The setback is determined by the front curve of the clamp area on the chassis. Look at these two leather saddles. You can see that the width of the clamp area in front is dictated by the shape of the nose. If the clamp area were extended towards the front of the saddle it would distort the skirts or require that the mid-section of the saddle be wider. Either of these changes would probably compromise the performance of the saddle.

This is why saddles with higher skirts (Swift, Swallow) can have longer clamp areas.