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NOM why don't we turn the original question complete volte face and ask them if the Allies best kit came along a year (or moderately more) earlier? Hang on that would mean UK having its own manufactured VT fuses for starters, so more Luftwaffe getting shot down far sooner...

17pdr starts to make a mess of panzerwaffe far earlier too, also a very good thing, Comet and Centurion tanks at DDay, NICE.

Start a new thread for that, it deserves it's own independent attention for such a large discussion.
United Kingdom, British Empire and Commonwealth only. We can have separate threads for the USA, USSR and other allied nations.

Edit

Bonus points will be awarded if plausible reasons for how it comes about are provided.
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