First Post - Hello all

Hi I have installed the new Region Tables and configured them based on Geolocation (e.g. miles from the store). When the customer clicks estimate shipping the code works successfully - however the postcodes are generalised and only look at the outbound part of the code e.g. NE1. Can I modify the uk_postcodes.sql to include the first digit of the inbound code to make the distance from store calculation more accurate. I know that I will have to include the grid references etc. but am willing to do this as delivery is only local and the items being delivered are very heavy so need to be accurate with distance.

Any Ideas?