If you are a member of a UK academic institution you can get postcode boundaries from the UKBorders project.
The UK Office for National Statistics also publish the postcode data and grant you a single end user
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I've put together a web-based UK postcode selector using the KML features of Google Maps and jQuery
Ideally what I want is to build my UK maps, sometumes by postcode (or outcode) also by region, county and so forth. Could you please help?
Find the Postcode, Address and Co-Ordinates for any location by simply right-clicking on our map.
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There are 124 out codes in the UK postal system. This KML file contains 124 polygons that represent each outcode boundary.
In the UK, it knows the first half of the postcode (“AB1”) but not the full postcode (“AB1 2CD”). It also sometimes knows the centroids of, for example, postcodes which allows the construction of a point-based map, but not the polygons needed for a shaded map.