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CraftyClicks UK Postal Address Lookup API

The Crafty Clicks web service gives access to the Royal Mail Postal Address File (PAF) - allows building a postcode lookup function. The RESTful API takes a UK post code as input and returns a list of matching addresses. Responses are in JSON(P) or XML format and a Java Script wrapper is also provided. The trial is free, but subscription is needed to use on a live system.