title: Create post-code based service
body: <p>I want to create a United Kingdom(London focused) post code based application. For instance, one of the basic queries would be: </p>
  
  <ul>
  <li>User comes and types their post code, determine the n most nearby objects to the post code they typed in.</li>
  </ul>
  
  <p>I am using noSQL(MongoDB) and I benefit from DB native geo-spatial objects. </p>
  
  <ol>
  <li>How do I link geo-spatial coordinates to UK postcodes?</li>
  <li>Is this long-lat to postcode conversion the right approach?</li>
  <li>Is there a service available to cover that part?</li>
  <li>How do you convert from London post code to latitude and longitude
  so that you can measure distance?</li>
  </ol>