google maps autocomplete limit to specific country only

Hi

I would like to limit google maps autocomplete to UK address only,

I have came across this.
https://developers.google.com/maps/documentation/javascript/examples/places-autocomplete?csw=1
https://developers.google.com/maps/documentation/geocoding/#ComponentFiltering


If possible, I wonder
1. what files I need to modify for easysocial?
2.code change can be something simple as it is below or modify geocode?
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false®ion=UK";>

If you know where to look or previous example, please let me know?
I would like it to apply the rule to any maps within my site.

Many thanks

H