Hello,
Recently I've been having some issues with the CultureTypes.SpecificCultures as for a reason I don't know I can no longer retreive United Kingdom Culture from it everytime I ask GetAllCultures() Method.

Did they change this?

en-GB is United Kigdom's culture name.

Have a look at following code-snippet which returns English cultures:

 var list = CultureInfo
             .GetCultures(CultureTypes.AllCultures)
             .Where(x=>x.TwoLetterISOLanguageName=="en");

 foreach (var cultureInfo in list)
 {
   Console.WriteLine(cultureInfo.TextInfo.CultureName);
 }
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