If there is a reason that children in Preston are more likely to get injured on the roads, it would be due to the amount of driving schools that operate there, driving through all the estates.
(That's where I successfully passed )
Anyway, there was a report over the weekend that said Kensington and other super expensive areas in London, are turned into drag strips in the summer for rich folk, whom never have to pay parking tickets as there is no way of tracing their foreign registered super cars. (It may have been the Daily Mail looking for a moan)
Point being, that hardly sounds like a safe environment for kids to be playing out in.