patterns like the Police...? Ok so yes, they were like normal police cars, but instead of being blue and yellow they were Black and Yellow.
Instead of saying Police + the District on the side and front, they all said Defence Security.

I have NEVER seen one let alone a convoy of these vehicles before. Nor is there a military base anywhere near me :/

I don't think that they were necessarily MP's (Military Police)... Although they might have been a newer upgraded version?

If anyone could shed some light on this please, it would be great... Again, just seems a bit off for the area that I am in :/

Cheers

You didn't see any cars. Just forget the whole thing. We prefer to remain invisible.

Actually, they are a firm who install burglar alarms, but they like driving about in BMWs with silly paint jobs.

M.O.D training cars maby?
or as know it all said above