We’ve heard from a number of users that they have problems with UK postcodes getting located. I always assumed it was something I wasn’t doing quite right, but it appears that there are a number of issues surrounding geocoding uk postcodes.
Apparently it has something to do with the “Royal Mail” service and copyrights. The UK would be smart to get this sorted out, zip code databases are a staple of open GIS in the U.S…. I am not sure why it would be different overseas.