Just thought I would share these recent discoveries.
Up until now I have been editing the mod.cartthrob.php file to set the countries I want to ship to.
Chris has explained that this can be set much easier by editing the file found in modules > cartthrob > lib > _locations.php (to use, change name to locations.php)
Another request I had was the ability to set countries in bands for easier shipping / VAT / Tax purposes for example band 1: UK, band 2: EU, Band 3: rest of world
This is also doable as Chris points out:
same as above. just add extra array keys with the array value set to “” => “————Band 1————-”, (or something like that)
I hope someone else finds this helpful!