Do you ever get tired of entering your address on websites and wish there was a way the site could "read your mind"? For now, the next-best option is address prefilling. All you have to do is enter your postcode and perhaps house number, click a button on the page, and the website does the rest. It's not just about convenience for the website user though. Website owners can benefit from greater accuracy of data to, for example, reduce delivery errors. How does it do this? The key is to have a licence to the Post Office Address File which lists every address in the UK. There are several companies that offer services based on this - we often use Postcode Anywhere who provide us with a rich set of facilities ranging from basic address filling, through "where's my nearest branch" searches, to sophisticated checking and cleansing of data you have already collected.