There are many books and manuals available regarding the area of electrical installation and the IEE regulations. From the many titles available the following are recommended reading and could strongly support any electrician actively updating their training or working in the inspection and testing field.
Click on the links to review the book and/or buy at

A Guide to Understanding the 18th Edition Wiring Regulations
Author: David Tinsley & Andrew Garrad

A Guide to understanding Inspection and testing of Fixed Installations
Author: David Tinsley & Andrew Garrad

Guidance Note 3 to IEE Wiring Regulations BS7671: Inspection and Testing (Guidance Notes for Bs 7671)am4
Author: The IET / IEE
Available: IEE Press

am5Guide to the Wiring Regulations: IEE Wiring Regulations (BS 7671:2008)am1
Author: Darrell Locke

Practical Guide to Inspection, Testing and Certification of Electrical Installations: Conforms to IEE Wiring Regulations / BS 7671 / Part P of Building ... 7671/Part P of Building Regulationsam2
Author: C.Kitcher

17th Edition IEE Wiring Regulations: Explained & Illustrated: Explained and Illustratedam3
Author: Brian Scaddan
Available: Newnes Press
Comment: Easy Reference - many other titles by same author avaliable if style liked.

Handbook on BS7671: The IEE Wiring Regulations - A Handbook of Compliance
Author: Trevor E Marks
Available: William Ernest Publishing - ISBN 9510 15656
Comment: Well laid out - highly technical - contains a large amount of information not found easily elsewhere - good for 2400 (2391-2) design work.

Inspection and Testing: Guidance Note 3 (Wiring Regulations and Associated Trade Publications Series)am11
Author: The IET / IEE
Available: IEE Press

Guide to the Wiring Regulations 2008: IEE Wiring Regulations (BS 7671:2008)am9
Author: Darrell Locke
A first class, easy reference document with many illustrations and explanations.

The Electrician's Guide to the 17th Edition of the IEE Wiring Regulations and Part P of the Building Regulations (1st Edition)am15
Author: John Whitfield
Excellent for those moving from industrial to domestic work.

1Basic Electrical Installation Work: NVQ Level IIam8
2)Advanced Electrical Installation Work: Level 3 City & Guilds 2330 Technical Certificate and 2356 NVQam10

Author (both): Trevor Linsley
Best buys for level 2 &/or 3 apprentices and trainees.

1)City and Guilds Exam Success: Inspection and Testing (IEE Wiring Regulations)am14
2)Exam Success: IEE Wiring Regulations 2382-10am12
3)Exam Success IEE Wiring Regulations 2382-20am13

Author: Paul Cooke & Jonathan Elliot.
Published by: City &Guilds
The definitive revision books for the inspection & testing or 17th Edition courses, written by the exam board thus covering all essential points.