Unmarked police?

[AlexiusG55]

I don't think this forum has a thread like the S Wales one for unmarked police you've seen- just to be on the safe side, and also in case anyone sees anything particularly unusual.

I'll start:
Dark grey Skoda Superb saloon LK59ALU seen very near Parkside Police Station, driver in uniform and strobes behind grille (not on).
Would this be a traffic car (the VR6 is quick), a senior officer's personal car or something else?
I've not seen a police Superb before, and it's interesting that Cambs would be driving one with a London registration...