Thank you to Ordnance Survey for making the UK Postcode database available. From the 1st of April 2010, OS OpenData was released, including geo-information, UK full postcodes and topographical information.
I have now installed the UK postcode database and made it easily indexable to the websites I host in Manchester.
The data is invaluble especially with UK Parliamentary constituency information contained within, linking that to the UK Government open data allows for some amazing mashups. One of which can be seen on my Facebook linked Application
Which allows a user to type their postcode in and get the constituency they are in…. previous election results etc etc