My 1961 Mk2 Jag tool kit had one and it's also in the Norton Commando tool kit.

https://andover-norton.co.uk/en/shop-drawing/88/toolkit-and-skid-plate

email (option): horror@blueyonder.co.uk

I found a complete pre war MG toolset in one of the pre war MG specialists' stalls yesterday, and that one contained a magneto screwdriver as shown in your picture. So if that MG specialist knows his stuff, this must be a pre war tool...

Jan

email (option): wd.register@gmail.com

Thanks chaps, that looks promising.

Rob

email (option): robmiller11(a)yahoo.co.uk