Hope this is not considered a verboten cross-post since I also posted this information on the The Lee Enfield Knowledge LibraryCollectors Forum on this site, but I believe the information is useful to more than just the Enfield community.
FYI, if you have the first editions of any of David's "bibles" (prior to 2010/2011/2012 respectively), you're missing considerable additional information.
I only recently learned of this series (thanks again to Sapper740) and not knowing second editions of all three were available purchased the originals from various second-hand sellers. When another thread alerted me to David's website I learned the second editions are available direct from him at literally the same prices I paid on the second-hand market for used copies of the first editions.
His website, WWII BritishMilitary Surplus, WWII British Tommy Books, British Militaria, details the additional material in the updated editions as well as the other goodies he has for sale.
I have no business relationship with him other than as a satisfied customer, and believe our community should know about his resources.