Setup Shipping, County Price, Cheaper Postcodes within County?

Shipping Setup,



Hi,



Im currently trying to setup shipping, however what I thought was the correct setup on how to do things does not seem to be working.





I have setup the following locations:



Lincolnshire → Lincolnshire, United Kingdom



LN 4/7/8/9/10 → Lincolnshire, United Kingdom

This is setup as the above location but with post codes added:



LN10*

LN9*

LN8*

LN7*

LN4*

LN5*





I have setup a standard courier shipping price for £15 for lincolnshire.

I have setup the same courier shipping but with £5 charge for the LN postcode location.





However the cart only seems to pickup the cheaper £5 LN charge, regardless of what postcode is used?



Please would you tell me how to go about fixing this setup.

Thanks