Thank you all for recommendations. Also, as a lover of detective stories, I'm glad I'm not the only one who didn't warm to the Train / Gone books, or to Sophie Hannah (I couldn't finish her adaptation of The White Horse which completely altered the sense of it)
I love all sorts of detective stories, and lockdown has put me on a big re-read. I love the Sharon McCone series by Marcia Muller - a private detective who seems real, who ages and changes. A word of warning should you want to try them:
MM allows very little on Kindle, I borrowed them from the library years ago, and have now bought second-hand copies (abebooks).
Also, having kept the series alive and fresh for 30+ years, the last few have been disappointing. So please begin with the early ones - you can see them all on fantasticfiction.com. I am not sure why she is not as well known as Sara Paretsky or Sue Grafton, but I think she wasn't publicised so much in the UK (should have said, they are set in San Francisco)
I'm also a big Val McDermid fan, but in a perverse way don't like her most famous Jordan / Hill series. I recommend the older Lindsay Gordon & Kate Brannigan series, and the newer Karen Pirie ones.