Thanks for your comments

All visitor feedback will be used to improve and develop the site.

The latest changes and improvements made following visitor comments include:

Simplified number formatting instructions for programmers and added extra explanatory notes
Feb 2013
Corrected listing for West Drayton
Feb 2013
Fixed typo in entry for Wem 01939
Jul 2012
Amended incorrect map for 019467
Mar 2012
Improved presentation of Northern Ireland details
Nov 2011
Corrected typo in entry for Manchester 0161
May 2011