Here it is. What you've all been waiting for.
At the moment, we just have simple lists of data, with limited checking. However, there are discussions about alternate formats, error checking etc - please join the FreePostcodes list for more information and to help out.
We have also noticed there is some incorrect data at the moment, but have not worked out how to automatically exclude it, so please don't go routing ambulances or anything like that based on this data.
Data is updated daily.
All of this location data is made available under the Public Domain Dedication and License version 1.0.
Essentially, you can do anything you like with this data.
In addition to our Public Domain data, there is now government postcode information available under a license similar to Creative Commons Attribution v3 license, as part of the OS OpenData project. You can get more information on this dataset from Data.gov.uk
Thanks to everyone for helping us create this data source, and campaiging to help the government see the massive benefits that postcode location data can give charities and enterprise.