Registration Country - Change to United Kingdom

Hi, my setup is:
CB:1.9.1
CB Subs: 3.0.0

I have got my CBSubs registration country field to work (and display on invoice);

BUT, I can only get it to work if I use Great Britain, but then at the invoice it automatically adds it as United Kingdom.

If I add the value 'United Kingdom' to the Country field; it renders a blank at the Invoice stage

What do I need to change to have the registration field display Untied Kingdom?

I have looked in the edit.front.invoice.xml, and the see the following:
<option value="GB">Great Britain</option>

But changing that to United Kingdom, still makes it render blank at the invoice stage.

Any pointers greatly appreciated!

The value you send CBSubs must match exactly. So for example if you want "Great Britain" the value you send CBSubs must be "GB". With CB 1.x this is a bit difficult as you end up with "GB" being displayed instead of "Great Britain". However, with CB 2.0 it's possible to have separate value and label. You could actually use the "_comprofiler_countries" database table that CBSubs creates in combination with CB Query Field and its Query Select type to have a dropdown automatically populated with countries with proper value and label usages.