5 Years ago after my brother had just passed his test he recieved an on the spot endorsable fpn for doing 36 MPH in a 30 in wales. It was issued by an officer using a speed gun. Fast forward 5 years and he has recieved a letter through the post refunding him 60 pounds. They state the road was actually a 40 MPH and council had incorrectly marked it :/ Thats all good and well, however he has been paying the obvious insurance hike ever since. How would we go about tackling the council for compensation?