It is very good. The author includes a note where she explains that she observed a particular QC in court who later read her book and made suggestions. She also mentions a book that was particularly useful to her 'The Devil's Advocate: a spry polemic of how to be seriously good in Court' by Iain Morley, QC, that sounds excellent. (I am a writer as well although at the moment I'm more focused on translating other people's books). Your comment has reminded me that I want to check out that book... Good luck with your writing!
Thanks so much. The Morley book sounds good and it has a recent update, although as I have moved back to Spain I don't think I'm likely to find one reasonably priced.