FODPlod (#63),
At the time, I would think that almost all our available destroyers and frigates would be fully committed to the Western Approaches defence, and to convoy escort duties. Churchill was only too glad to concede land rights in a number of British possessions on the Eastern seaboard to the US in exchange for 50 WWI obsolete coal-burning destroyers to help in the fight.
..."equipped with small and medium calibre guns"... They'd be lucky ! At ITW as late as summer '41, I learned "armaments" with an (obsolete) Vickers G.O. gun - as all the Brownings were needed in service. I mounted guard with a "pick-helve" - as the "Local Defence Volunteers" (later the "Home Guard") had had to do in 1940.
..."and able to produce a wake"... You mean a repeat of the Dunkirk: "Day of the Little Ships" ? Well, even if it could be laid on again (and you would need guns (if any) and mountings fitted (which would need time, and who would work the guns ?) the Me 109s, 110s and Stukas should have litle difficulty in polishing them off (we are assuming the RAF, defeated, is no longer there).
The truth is: we do not know what might have happened, and it is pointless to speculate. We only know what actually happened - the RAF won ! (and we are all speaking English still).