Unmarked Traffic Cars

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Hello folks, just a quickie. If, when driving along, an unmarked car attempted to pull me over to the hard shoulder by using flashing lights etc, am I legally obliged to stop? If, for example the occupants get out and are not wearing uniform could I just drive off? Just wondered as some scumbags have fitted lights to cars to make them look like Police vehicles then nicked the car they just 'pulled over'.

I would appreciate your thoughts.

Regards

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Thanks a lot for the reply. Not had cause to do it yet but you never know......