While I doubt Sealion could ever work, I always have issue with the "war games" proving it was doomed to failure. The war games always have the German units surrendering instantly, no major skirmish, no hold outs, just British troops find the Germans and they win.
How about having the Germans capture the entire BEF, then ask for the British to sue for peace or if they declined gas the entire BEF.
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It's not that difficult. Soldiers out of ammunition, fuel, and even food, tend to surrender quickly. The point is not that the British ground troops find the Germans and win. The point is that the Royal Navy finds the supply/reinforcement convoys, sinks them, and wins.