While over the years there have been various AH attempts on how to improve Fleet Air Arm or surface combatants of the Royal Navy, how about submarines for a change?
How could one plausibly increase efficiency of Royal Navy submarine service in WW2? Some thoughts on (somewhat) plausible developments which come to me would be:
Specified ASW submarine to be developed, whether improved R class or something completely different.
Ideas on how to attack enemy at bases, perhaps taking a note on what Italians did in WW I, including:
Well prepared scheme of attack to be employed from the outset of war
Special forces operations with Royal Marine personnel would be fairly cheap to develop pre-war - if there were impetus
Laying magnetic mines (introduced by RN already in 1918) from the outset
Midget submarines to penetrate enemy bases
Any other ideas?