C'mon you lot. Everyone knows that it was condensed milk and bread and dripping that got the Brits through Their Darkest Hour. (Not together, mind...)
Anecdotal-and-unassailable confirmation: A few years ago, I was sitting on a bench beside my camp on the Rideau Canal, cuppa tea'n'condensed milk in hand, when a 70-ish gent walked by and said hello. He had a hint of a northern European accent--I was guessing Dutch. We chatted, and I asked him if he'd like some tea, apologizing that I had good black tea, but only some condensed milk. He said, "I love that stuff! It reminds me of my childhood." "Oh?" sez I, "how so?" He said, "I was born in Holland, and when I was about seven, just before the war, my family moved to the UK. Throughout the war, we had only condensed milk, and it's my overwhelming memory of that time, and a good one. Strange thing is, almost nobody uses condensed milk nowadays, and some people haven't even heard of it."
"Ah," sez I. ""Tis only a few connoisseurs that know this secret. Who'd ever have guessed, eh?"