Postcode Software is an external geospatial lookup service for the UK.
Caution: this software is under development and is not release-ready. Don't blame me if the kittens don't make it!
This module will provide APIs and tools to integrate with postcode anywhere. You will need a paid-for Postcode Software account in order to make use of the module (although limited functionality - lookups within the LS18 postcode anywhere - is available without an account, for test purposes).
This module draws heavily on the code from the UC Postcode Software module, abstracting the postcode lookup so it's not tied to Ubercart.