WARNING: The following post may contain content unsuitable for those who are not RAF Camo and Markings nerds...
Yup, got that book somewhere, written back in the early 70s I believe... but also have two more recently written books that are highly recommended:
On Target Special No.2,
Britain Alone: The camouflage and markings of British Military aircraft
June 1940 to December 1941,
Paul Lucas, Illustrated by Jon Freeman, Series Editor Neil Robinson,
The Aviation Workshop Publications Ltd. October 2003
ISBN 1-904643-06-X
Scale Aircraft Monographs. #2
"The Battle for Britain, RAF; May to December 1940"
Author: Paul Lucas
Series Editor Neil Robinson
Guideline Publications, Ltd. July 2000
ISBN 0-9539040-0-8
Paul Lucas not only spent huge amounts of time researching in museums and archives, he also worked with 'aircraft archeologists' studying wrecks and seeing what was actually done in the field regardless of what the boffin regulations said. Colour photos of examples are included in the second book I listed. Well worth the money. Great section on paint colours and Federal Standard substitutes although it must be stressed that most of the FS numbers given are 'closest' equivalents as the majority of these colours don't exist any more on either the Federal or British Standards lists.