Now out of print I only have a few copies.
The book is split into 24 sections and covers the following signal boxes/lines:
The book has 300 pages and is primarily constructed from pictures from inside and outside of various signal boxes.
Birmingham New Street
Liverpool Lime Street
North Warwickshire Line
Edgeley Junction No. 2
Block Bells, Buttons and Dusters book
Harringay Park Junction
Leicester to Peterborough
The Fylde Line
Nuneaton to Leicester
Bescot to Rugeley
Smethwick to Hartlebury
Pinxton to Sleights Siding East