Driving down the M1 today in South Yorkshire in torrential rain i was passed by a convoy of 10-12 unmarked police cars using lights and sirens at 90+ mph , rather them than me. Unusual combination of cars, Seat Leon, Golf, Audi A1 , Mini didnt see others as it was raining really heavy , i just wondered what was going on also never realised A1 and minis as unmarked traffic cars

Training new traffic officers, perhaps? I have heard of a new recruit being instructed to drive at 90+ on the motorway in an unmarked car, but without using blues and sirens. Teaches observation and anticipation, no doubt.

You would be amazed at the variety of vehicle the police run. Most unmarked for obvious reasons. Usually in a convoy as described there is some dignitary or other being ferried about for official visits. Can't have our betters held up in traffic now, can we?

Cheers Concrete

I'd love to be a fly on the wall when an unknowing patrol car comes across an unmarked car driving at such speed ...the chase would be interesting!

A few years ago now I was at home one night in Bilbao where I live and I heard a succession of deafening bangs down in the street. It turned out that an unmarked car full of (Spanish) civil guards had been following another unmarked car full of (Basque) police and both groups of police officers were convinced the other lot was an ETA hit squad. After a brief Mexican standoff and much shouting, they all started shooting at each other. Luckily no life threatening injuries and only one hospitalised police officer, but a lifetime of report-writing and I dare say some months of school crossing patrols for all involved.