I take your point TH but I think the way it was done really didn't give me much thinking time. They were not behind me for a long period they just suddenly appeared off the last bend of that section and were behind me in an instance blinding my rear view mirror and when I looked through my side mirror I saw a flashing light as well but it was white not blue

. You don't have much time to think in circumstances like this but ignoring a
police car was very much in my thoughts!
The blue light occurred to me when I said I was suspicious though I also considered an off-duty
police man as well! It was the road positioning right alongside me blocking the carriageway (and blocking my exit incidentally) as I had managed to get off the road rather than pulling in front or behind me that made me suspicious and the fact they didn't get out of the car straight away. When I asked for ID the driver said he would show me some ID and I then sat there for about a minute with nothing happening and then got out of the car (which was obviously what they hoped I would do

) turning the engine off and pocketing my keys. I believe the later victim left the keys in the ignition and when he went to the rear of the car the passenger jumped in and drove off with the victim trying to stop him. I think the guy who got out of the car may have realised I had the keys and he would have to take them off me!. It was easier for them to drive on and find an easier target.