The Urban Outlaws series is great for older primary school children. Perfect for fans of Young Bond or Alex Rider.
The Outlaws are a group of children, who feel alienated from society and live in an underground bunker from which they use their cyber skills to fight crime. The books have thrills, spills and cool tech. The principles of hacking are also outlined. The villains are a little cheesy, but the Outlaws themselves are great characters with a crackling camaraderie between them.
My son has devoured this twice in the space of a few months. Definitely worth a look.
Reserve from Surrey Libraries, here. Note, the first book wasn’t available to reserve at the time of writing, but a new copy was on order.