WWII Naval Book: Atlantic Escorts and HTML5 Browser Bismarck Game

I have a very soft, weak compulsive spot for WWII naval stuff, so when David Manly recommends a "good" book I am a sucker, albeit a happy one (see below, the checklist was easy to complete - naval, WWII, Battle of the Atlantic, RN, escorts .. what is not to like):  

And in addition I already had three of David K Brown's books on warship design through the World War eras (to complement my Conway and Janes). In short, as you would expect, when a naval maritime designer recommends a naval constructor's book and says "it is good" then, it is good. One thing to shout out is that it does concentrate on the technical bits. WATU (Western Approaches Tactical Unit) is not mentioned (well not in the index - as I have just started reading it I might come across it yet). The Raspberry, Pineapple, Beta Search, Step Aside tactics are not mentioned.

For more details on these see: 

https://en.wikipedia.org/wiki/Western_Approaches_Tactical_Unit

Or see the BBC interactive game: 

https://www.bbc.co.uk/history/worldwars/wwtwo/launch_gms_battle_atlantic.shtml

It "was" a great game but you need Flash 7 (a now deprecated multi-media scripting language) that most modern browsers have moved away from (aka uninstalled and blocked). 

Update I: Some Flash games can still be accessed (there are clever people in the world): 

https://www.youtube.com/watch?v=yyw5qT3XbhM

Note: I have not (as yet tried this myself)

Update II: HTML5 WWII Games - Addictive ...

https://itch.io/games/html5/tag-world-war-ii

https://speculativesimulations.itch.io/defenders-of-the-atlantic

"Defenders of the Atlantic" is VERY ADDICTIVE