Simply Postcode Look up Software Pricing:
The Royal Mail makes a distinction, when it comes to pricing, on how the address information returned is going to be used and the address detail returned:
For Internal Use
Used by an employee for the purpose of populating a database or to send Goods/Services.
Please visit the link to view internal postcode look up software prices
For External Use
On a public facing web page to capture customer address, entered by the customer, to provide services or goods.
Please visit the link to view external postcode look up software prices
Address Detail Returned Comparison
All Postcode Look Up address products return two different levels of addressing:
Full Address Level
Top Company Ltd
Half the price of Full Address License
User needs to complete address
More expensive than Thoroughfare Level
Postcode Address Search Options gives more information on these search options.