Although the Home guard were largely seen as one of the more ineffective military forces the UK has ever assembled, within it were much more elite units whose purpose was to embark on a guerrilla war (sabotage, assassination etc) against German forces in the event of an invasion. They, at least, were a bit more serious.
I don't think it was that they were ineffective. Germany never managed to get troops to the UK so they didn't get to do much

They did man anti-air guns though.
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