title: Convert coordinates from British National Grid (Easting, Northing) to WGS84 Lat Lon
body: <p>I am struggling to convert with R coordinates from British National Grid (BNG) to WGS84 Lat Lon.</p>
  
  <p>Here an example of data:</p>
  
  <pre><code>df = read.table(text = 'Easting Northing 
   320875 116975     
   320975 116975     
   320975 116925     
   321175 116925    
   321175 116875     
   321275 116875', header = TRUE)
  </code></pre>
  
  <p>How can I convert the Easting and Northing to WGS84 Lat Lon?</p>
  
  <p>There is a function called <code>spTransform</code> from <code>rgdal</code> package but the documentation is very confusing.</p>
  
  <p>Any suggestion?</p>