What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunatetly, it is not possible to move a country by choice to the top of the list from the built-in form builder. However, you may enable United Kingdom as the default country so that it is selected automatically when the form is loaded.
The other option can be getting the full source code of the form and edit it to reorder the country list by your choice so that the edited file can be hosted on your webhost.
Hope this information helps.