You have a few contacts at New Scotland Yard, the new home of the Metropolitan Police, or you do work for them on the side. You may have particular knowledge they have found useful, or perhaps they somehow owe you a favour. Either way, you have a certain degree of access not usually granted to the public.
You know enough detectives well enough to get inside information on crime in the city. You can investigate active crime scenes and ask for reasonably up to date information on ongoing cases. Quite often, Scotland Yard will come to you to get your thoughts on a baffling case.