The Albion Roar
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It's a long time since I read the first book, so I may have got this wrong, but I don't recall Grace being assigned to a dead end job. I'm sure he's in charge of the case in fact. And in a later book, he's up for promotion and loses out to Cassian Pewe. I'm not sure how the producers of the TV show are going to manage to fix it so a high-flying officer up for a senior role is an officer under threat of dismissal.
The detective who's always being taken off the case by a superior officer is a bit of a cliche in TV detective shows and I'm not sure it's needed here.
When's Cleo coming in?
I don't recall Cleo becoming a more major character until book three or four. If she was in earlier, there was certainly no hint at luuurve. Also, if she was in the first book, given the time constraints, it is a plot device that can wait for the TV series.
My concern - assuming they film the rest of the books - is how they get the Sandy sub-plot into each 96-minute show without making the rest of the detective story seem rushed or squashed.