I've always been one of those wishing people to mind their business when I read a "why was the police outside my house"... but just genuinely wondering what it could be...
Would it be a very VERY undercover van?? My dad told me there were detectives who used to go undercover to the point they'd blend in with drugs gangs for several weeks... a bit like method actors... Would the police go so undercover to the point their van wasn't MOT-worthy?