[Closed] So who gets a police escort?

Driving down to N Wales today and we came across a couple of police motorbikes with all lights on coming the other way at the back of Caernarfon. It looked like they were stopping traffic (although a fairly quite road) - we carried on down the road and 20 seconds later there was a fairly fast moving convoy headed by two more bikes then two unmarked X5 and finally a police car all with lights going but no sirens.

So the discussion in our car was who was in the convoy - girls thought Simon Cowell or Cameron while my money was on some Royalty.

Question is, who gets a police escort nowadays?