I'm currently using version 8.0.0 on a Wetek Play.
Under Settings / Interface and the sub-heading 'Unit Formats' an option exists for 'Timezone country'.
I was looking for the United Kingdom of Great Britain, which is more commonly known as UK (for United Kingdom) or GB (Great Britain). Official examples of both are in use, rarely is our full title used.
In my first attempt to find it, I didn't see it because it's labelled as 'Britain (UK)'. It should be either Great Britain or United Kingdom or the two abbreviations: GB or UK.
Please can you amend to avoid confusion? I would recommend UK to be consistent with 'Region default format' which has 'UK (24h).
BTW great piece of software.