If you want to find out just what cars the police are using go to their service/repair centre for unmarked cars in Greenwich, it's next the self storage place and what was platform builders merchants on anchor and hope lane as your looking at the front of the self storage place, go down the left side of it all the way to the end in the left corner is a building with a yard that has an 8 foot security fence around it.
They don't like people knowing what it's for but seeing as I put the fence up it wasn't hard to find out, especially as I would talk to the people working there. they even used to have an old an 80s cavalier. c reg whatever year that is.
They used to have police in and out all day long in their unmarked cars, wasn't very good when I think that I was working with 2 other people, 1 always had drugs on him and the other was a dealer that had just got out from prison after selling to an undercover copper.