Google forms auto fill based on text entered.

I have built a basic form in Google Forms for a local club to collect data on who buys tickets each week in a local draw. The details for about two hundred people need to be entered each week. About 90% of the customers are repeat buyers, so their details are already in our Google spread sheet.

This is a lot of work for the guy who has to enter this data each week. So I’d like to arrange a system whereby the form would auto populate with details taken from the spread sheet as soon as the last names field has been filled in on the form.  

I’ve played around with the Get Pre-filled URL but I was unable to get it to work in this instance. I suspect that this would a very useful fix if anyone can manage to find a solution.

I have reproduced the fields in my form below.

FIRST NAME (Text)
LAST NAME (Text)
MBL NUMBER (Text)
LL NUMBER (Text)
ADDRESS 1 (Text)
ADDRESS 2 (Text)
ADDRESS 3 (Multiple Choice)
WINNER (Radio button)

Robbie.