قالب:بيانات بلد بريطانيا العظمى

I don't have access to the specific context of "Template:Country data Great Britain" from Wikimedia that you're referring to. Without seeing the actual template documentation or its contents, I cannot accurately describe what it is and why it matters based only on the information provided to me. To write an accurate overview as requested, I would need you to share the template's documentation or description.

AI-generated from the Wikipedia summary — may contain errors.