Brilliant!

LISTO is an excellent little addition to Contact Form 7. Saves lots of time. Only one small snag in the list of countries is that they’re sorted in alphabetical order of the 3-letter code for each country, rather than the country’s name. Most of the time that makes hardly any difference, except for the United Kingdom, whose three-letter code is GBR, which places the UK between Gabon and Guinea (or somewhere around there) in the drop-down list, making it v diff to find. But this is easily sorted. Just manually move that line by editing the list in the file countries.php in wp-content/plugins/listo/modules/. Problem solved. Great plugin.