One of the aircraft ordered for Capital as N6597C is, of course, G-ANCF preserved at Liverpool.

You’ll need a scanner with some good built in smarts like ICE or FARE to remove dust and scratches, but larger debris is likely to need hand retouching.

Alas, you’ll have to do all dust removal by hand. ICE and FARE rely on the dyes in colour slides and negatives being transparent to infra-red light. The silver in an old-style black and white negative is opaque to IR, and the software just treats it as so much dust and removes it from the image.
Kodachromes are also unsatisfactory after ICE/FARE treatment, for much the same reason.

If the first prototype ended up at Marignane and the picture was taken in or near Paris, then the unflown second aircraft seems a likely candidate.

I’ve done some Googling and I suppose I’ve answered my own question.
Jewish PoWs from the Western allies were treated fairly well, although sometimes segregated within the camps. There were exceptions, though, notably the transfer of American PoWs from Stalag IX-B to the slave labour camp at Berga. Most of them were Jewish, and around 20 per cent of them died in just 50 days.
On the eastern front it was a different tale. The Soviet Union had not signed up to the Geneva Convention and from the Nazi point of view that gave them free rein to do what they liked with Soviet PoWs (and vice versa). So many of them died in camps at German hands that the percentage of Jews is hardly relevant. They all suffered horribly, and the Jews possibly more than most.

A bit difficult to hide circumcision, though. Obviously not a 100 per cent indicator of being Jewish, but in the fevered wartime atmosphere it could be difficult to explain away, I would imagine.

I hadn’t heard of the mag, I must admit, but I’ve had a look through its website http://www.hemmings.com and it looks a good ‘un. 12 US dollars for a year’s subscription to the digital edition looks like brilliant value for money for anyone with even the slightest interest in car collecting, anywhere. Thanks for the tip.

The order appears to have been made more than once, if I read this exchange correctly from the Nuremberg trials:

http://www.nizkor.org/hweb/imt/tgmwc/tgmwc-03/tgmwc-03-21-14.html

the pilot who doubled for Norman Wisdom in “It’s in the Air”

Don’t you mean George Formby?