A Practical Introduction to Teacher Training in English Language Teaching covers routes into teacher training, techniques and ways to structure sessions, lesson planning, different approaches to observing lessons and providing feedback and planning, managing or coordinating a training course.
I wish I'd had this very useful book when I started out as a teacher trainer. I've now encountered a lot of the ideas mentioned in the book, not least through John's own blog: https://elteachertrainer.com/ but it's still useful to have everything all in one place as a reminder. I'm sure I'll end up referring to this many times, and will inevitably use it with up-and-coming senior teachers and ADoSes too. Thanks for writing this much-needed guide, John!