CC, I know.
But try to imagine how intensive it could have been WITHOUT the RAF.
After all, Britain is a democratic country, so I'd say that Hitler's words there were not so far off.
And the Channel? Well, it's narrow waters, so the LW could mount several sorties a day. Would doubtlessly have been very ugly.
RN vs KM and LW? Well....ugly I'd say. Torpedo boats, Destroyers, Cruisers, Subs and capital ships jabos and Stukas all in the drink...