British Rail - Driving Instructions Including Preparation and Disposal Duties. BR/AEI/Sulzer Type 2 Locomotives.
Issue Date: August 1964   -   BR 33003/104.

More information can be found here Wikipedia - British Rail Class 25  Wikipedia - British Rail Eastern Region  
More Information Regarding Preserved Class 25 Locomotives can be found on the following websites:  Preserved-Diesels  Caledonian Railway Diesel Group