Sorry no, we are not too small for that.
Well, yes you are...the british islands can never compete with an 80 million people, highly industrialized, armed to the teeth country.
You were no different to the rest of Europe the army overrun...only GB weren't on the menu.
If Hitler had meant really business he didn't even would had needed the Luftwaffe...concentrating on a blockade with the wolf packs would had been much more efficient!
In no time GB would had been forced to negotiate, as did Germany after WWI. Such a blockade becomes nasty very soon. And starving people are much more agreeable to any kind of change!
But Hitler had a soft spot for you...don't make it to something it wasn't only because it pleases your ego...