Release's Sex Workers and the Law is a comprehensive and well researched publication detailing the legalities of sex work in the UK today.
This edition was updated in 2013 and is the most current available publication on UK law and sex work.
Sorted Men is a male sex worker guide from the UK Network of Sex Work Projects. It covers general information about escorting, as well as an overview of related topics such as working in porn, the law and sexual health.
Published in 2008.