Using Microsoft MapPoint any popstcoded data can be mapped to Ordanance Survey maps.

Please contact me for details.

Below is a simple example

GP Practice Locations in Northern England
GP Practices Northern England
Overview Map  
Pushpins
 GP Practice Locations
Multiple practices in one place
are marked with squares
Populated Places
 Major City (1,000,000+)
 City (500,000 - 999,999)
 Minor City (100,000 - 499,999)
 Town (20,000 - 99,999)
 Other Place
 Urban Area

 Based on Ordnance Survey electronic data; used with permission of the Controller of Her Majesty's Stationery Office. ©Crown Copyright 1997.