There are 3 books in the R.A.F. Quartet series. The newest book is Damned Good Show which came out in 2002.

1
Piece of Cake

Book cover of Piece of Cake
From the Phoney War of 1939 to the Battle of Britain in 1940, the pilots of Hornet Squadron learn their lessons the hard way. Hi-jinks are all very well on the ground, but once in a Hurricane's cockpit, the best killers keep their wits close. Newly promoted Commanding Officer Fanny…
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2
A Good Clean Fight

A Good Clean Fight
North Africa, 1942. Dust, heat, thirst, flies. A good clean fight, for those who like that sort of thing, and some do. From an advanced landing field, striking hard and escaping fast, our old friends from Hornet Squadron (Piece of Cake) play Russian roulette, flying their clapped-out Tomahawks on ground-strafing…

3
Damned Good Show

Book cover of Damned Good Show
They had joined an organisation that advertised itself as 'the best flying club in the world'. Now the young pilots of 409 Squadron are flung into battle over Germany where their training, tactics and aircraft are all found sadly wanting. The spirit of the gentleman amateur flickers and dies in…