I spent most of the year off from AH reading.
I would recommend
Len Deighton's
Fighter: The True Story of the Battle of Britain
Blitzkrieg: From the Rise of Hitler to the Fall of Dunkirk
Blood, Tears and Folly: An Objective Look at World War II
Bomber
The Bernard Samson Books: [Berlin Game, Mexico Set, London Match]
[Spy Hook, Spy Line, Spy Sinker] and [ Faith, Hope, Charity]
these are 9 books that all follow the same plot line, really just one huge long story. My dad says you dont necessarily need to read them in this order but in my opinion it better when you read them in the correct order.
also read
The Ipcress File; Horse Under Water; Funeral in Berlin; Billion Dollar Brain
Spy Story; Yesterday's Spy; Twinkle, Twinkle, Little Spy; SS-GB; and XPD
currently reading Goodbye, Mickey Mouse