everything south of a point in the UK

What i have is a program that loads all of the insulation leads that are produces in a day onto a web based application for our surveyors to see. Now my manager as asked if it would be possible to produce a piece of code that will seperate any leads that are south of northamptonshire to do somthing else with them.

Wot i am looking for is ideas on how i can approach this porblem since i am completly stuck with it. I thought about an arry that stored all the counties that fall in this area, once it comes accress one of them it does the new process.

Help Please!!! :confused: :confused:

In the U.S. we have zipcodes.

Does the U.K. have any type of city codes? and possible
an existing database you can tap into?

Otherwise, a county database would be the option (as you mentioned).

I'm thinking also of some GPS type thing (latitude entries) to determine
what is south or north.

if you need absolute accuracy, then you'll need to store latitude and longitude, there are a number of services that will provide these for postcodes.
If county-level is specific enough, then that will be far easier- there are about 110 countires in England and wales, so it would probably only take a couple of hours to do the data-entry required for that, while you'd probably spend at least that on getting the code for lat/long comparisons working.