There are close-ups of three pieces of traditional Fair Isle, and then six or seven jumpers. One of them looks at first glance like another example of Fair Isle knitting, but the close-up shows that the pattern is actually embroidered afterwards, not knitted in.
And I recognised the design! (Yes, I should get out more.) It's from a Paton's & Baldwin's 'Helps to Knitters' leaflet from the 1920s.
|Patons & Baldwins Helps to Knitters 147|
Evidently the 'Daily Sketch' competition was looking for excellence in execution, not necessarily original designs. And so it might be possible to identify some of the other winning designs too - there's a particularly elegant jumper below that looks very striking even in low-resolution black-and-white.