Integrate address lookup software/plugin to work alongside Google distance API

This is a taxi booking website and I need someone to implement/integrate the address lookup software/plugin to work alongside an existing Google distance API. Right now I am using the Google API to calculate the distance and to work out the price but the website is not capable to look up for the full address with the help of postcodes. I want the website to AUTO SUGGEST the FULL address with the help of postcodes just like www.minicabit.com.

To test the booking form of my website or the reference website, you can type OR copy and paste any of the following postcodes in the address fields.

The address lookup software that I want to use is www.postcodesoftware.net

My website URL is www.justcabbie.co.uk

The reference site is www.minicabit.com

Test Postcode 1:
LS61QD

Test postcode 2:
LS83QS

Test postcode 3:
LS61QP

Test postcode 4:
LS74LJ

Test postcode 5:
LS121QU

You may try any one of the above postcodes.

I also want to add the same "VIA" functionality to my site as in the reference site. right now my site can only have "One" via address. I want it to have up to 7 via addresses just like in reference site. Please use the above postcodes to test the via functionality in the reference site.