The value of the huge number of modern classic cars in the UK is £3.7billion.  One of the most popular of these models, which are no longer produced, is the Ford Escort, selling for £9,876 on average.  Research by Bristol Street Motors now reveals how many modern classic cars are still being driven, rather than left languishing on our driveways.  Valuable asset: The classic Ford Escort takes top spot as the UK’s most valuable surviving discontinued car, including the RS Turbo (pictured) And to check the worth of the 45 models analysed, the retailer looked at average auction prices.  Its report noted: ‘From the Morris Minor to the Ford Escort,…