Who do I keep seeing suited and booted in unmarked cars?

Can any of you good people help me solve my nosey Parker mystery..?

I’m in Kent and at least 2 or 3 times a week, sometimes twice in the same day - I see one of the same three unmarked cars lit up on blue light runs. An XC70 (or something similar) A V60 (or something similar) and An A6 avant

I’m intrigued because:

• They’ve got fully covert blues not just one stuck in the windscreen
• They’re always either 2 or 3 people up
• Everyone in them always without fail has black suits and ties on

Is this something mundane or do I in fact now live on top of an MI5 bunker?

Wrong answers accepted but correct possibilities preferred.