Address Lookup on Postcode (ZipCode)

Helloo Experts

Years ago I looked into how to reduce the amount of user input required to enter addresses and ensure that the addresses were correct.  The only solution back then was to buy a license (at huge cost) for a copy of the UK Post Office Address File.

These days I see many web sites that have similar functionality... So how's it done ?

thanks
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DodsworthAsked:
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AndyAinscowFreelance programmer / ConsultantCommented:
http://www.royalmailgroup.com/royal-mail-unveils-improved-access-postcode-address-file

specifically:
Improving access to micro businesses and small charities
From the beginning of July, Royal Mail will provide free access to PAF to micro businesses and small charities. These measures will encourage innovation and growth for those businesses and organisations in the crucial first year of operation. The measures are:

    Free access to PAF for independent (1) small charitable organisations (2)
    Free access to PAF for one year for independent1 micro businesses (3) to support them in developing PAF-based products and taking them to market
    An increase in free online address look-ups on Royal Mail’s website from 15 to 50 per day

with
Notes to editors:
(1) Independent - not associated or affiliated with any existing Solutions Provider
(2) Small charitable organisations – less than £10m per annum income who are registered charities or CICs
(3) Micro businesses – 1-9 employees and less than £2m turnover p.a.

In other words - they probably either qualify for free access or do as you did, purchase it.
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DodsworthAuthor Commented:
Hmm.  Are you sure there is no other way ?  I'm thinking maybe a company(s) that buy the data and provide it as a web service to subscribers ?
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AndyAinscowFreelance programmer / ConsultantCommented:
There might be another way, I don't know.  What is certain is that what I posted is a way that it is done.
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