The Research Funding Toolkit, published in 2012, is the definitive book on how to write better research grant applications. It is based on a workshop format devised by Andrew Derrington and on Andrew’s analysis of how grants committees make decisions about whether or not to fund an application.
There will not be a second edition of the Research Funding Toolkit. The first edition is probably still the best book available on writing research grant applications. If you want to read the book you can get a paper or kindle copy from Amazon or a paper copy from the publisher.