The first three books I read on paperback years ago so I recently decided to get the audiobooks of each and listen to them. They are so good. In the first one Glenister only does a very mild Cornish accent for Strike but they must have decided to amp it up for the subsequent books which is great.
His mastery of accents is amazing.
I also love how sometimes his voices almost descend into comedy, like for Pat's ultra gravelly smokers voice. Or in Lethal White there is a hysterical temporary secretary who he does brilliantly.
On re-reading the books, the most painful thing is having to go through poor Robin trying to make the Matthew relationship work.
Also, given how recent book Strike has given up smoking, is eating better and losing weight, it is so funny to see him in the earlier books smoking like a chimney, sinking pints at lunchtime every other day and eating fish and chips, burgers and kebabs all the time!