Forgive me if I'm wrong but Postcode search is a function of the map disc not the OS, does your map cd have postcodes on?? (in the town/city field type the postcode not the name of the town).

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.