The Doors.
Subtle has never been Merseyside Polices way but even they should realise that people should show ID before getting themselves let into buildings. So why do they insist on gaining entrance to my building by just saying it's the Police on the intercom to another flat. Have I missed something perhaps there is a special code word that only the Police can say, like a fnord, which when you hear it identifies the person saying it as a cop, or perhaps it is just the people they hang around with an breaking and entering comes naturally to them.
However the last lot where just doing a favour for Barry. Though Barry seems rather had to actually pin down, perhaps he is still a bit green.