Royal Navy submarine histories for the Second World War

What books are good starting points for Royal Navy submarines and their Second World War records?

Start with Norman Friedman's British Submarines in Two World Wars, then use Paul Kemp's The T-Class Submarine and John Wingate's The Fighting Tenth for narrower class and campaign studies.

Norman Friedman's British Submarines in Two World Wars provides a broad starting point for Royal Navy submarine history. Paul Kemp's The T-Class Submarine narrows the focus to one class. John Wingate's The Fighting Tenth follows the 10th Submarine Flotilla during the siege of Malta. The recommendations span general reference, class history, and a particular wartime campaign.