I have no idea what he has done, but I'm going to go out on a limb and suggest we may be able to infer what he did by looking for Merseyside and BAE connections.
I had a look for Merseyside Police scandals in 2018, lo and behold there is a CCTV facial recognition scandal that kicked off around October 2018. BAE have a facial recognition unit so its plausible he casually namedropped some information there. This seems plausible if he has a grievance, as some people don't like facial recognition.
Otherwise, BAE also supply defence kit into the Royal navy warships built in Merseyside, so both of those seem like good starting places. Although I can't think we had a grievance with Merseyside about this, the bloke works for BAE he cannot claim to be an eco warrior hippy if he works for a defence contractor.