Why does Croydon have the biggest postcode in the country?

Did you know that if you live in CR0 you are in fact residing in the most populous postcode district in England and Wales?That's right - according to the 2011 census, 154,233 of you live in CR0. That's about 35,000 more people than the next most populous - LE2 in Leicester - and a whopping six times bigger than the average population per postcode (24,713).It's the reason why we at the Advertiser constantly get (poorly researched) press releases saying Croydon has the most of 'x' or 'y' in the...