[Cloud]

Hey, im in progress in making a site, but i want it so if ppl enter their postcode and house number (in a form duh lol) it automatically enters there street. saving them time..
is there any freeware that can do this, i have downloaded only the 1st part of postcodes e.g ab12 thats aberdeen, but i need the street and town.
i know royalmail are charging 2500 plus 1500 to maintain in.

please can anyone help me?

thank you in advance.

nice site btw