Exactly how big are English livers?

Stumbled across this Navy headline in The Mirror on Wednesday night;

liver-bomb

which of course begs the question, exactly how big were English livers in WWII? I mean, the Germans built 7 foot long bombs to take them out.

Jan obviously meant ‘live bomb’ but to remove any further ambiguity the headline was changed a few hours later to read; WW2 BOMB GETS BLOWN TO BLITZ.