from the North

These are remarkable, he must have used a hand held camera from the cockpit. Somewhere in an archive there may lurk, forgotten and dusty, some survey imagery...

A Leica II. He had a side camera on the plane which he used to get some pictures of the lower slopes of Kanchenjunga (this was his official job), but these were, shall we say, unauthorized. Not least because he was in Tibet some of the time, which was a closed country.
Which was why the interest moved from the N to the S for climbing Everest

the Everest pictures were unauthorised, not the Kanchenjunga ones!
He went back to Kanchenjunga the next day to get a ton of official photos, as these were (a) somewhat urgent, and (b) as good as it was going to get for a while.

Absolutely stunning. Particularly like the tip of the spitfire bottom left. Another valuable historic picture. To think, somewhere down there lie mallory and Irvine. Another one for the Alpine club archive!

Alpenchris. That will be bottom right.