The new 26 registration cars began on March 1st this year, but in truth this will have little to no effect on the prices of vehicles that are ten years old. As for where to buy a used car from you can read our in-depth guide here - www.honestjohn.co.uk/advice/car-buying-advice/buyi.../ but in brief, choosing where to buy from is a matter of balancing cost versus risk. Private sales are generally cheaper compared to independent or main dealers, but you have much less recourse if something goes wrong. Buying from a dealer is more expensive but may come with a warranty and you have more protection if there is a fault with the car.