Trying to enforce UK date culture - webapi

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C#

WebAPI

ASP.NET-Core

Having a strange Issue with ASPNET Core Web Api.

I have setup the globalisation in the startup.cs I have set the cultures (well I believe!).

public class Startup
{
  public void ConfigureServices(IServiceCollection services)
  {
    services.Configure<RequestLocalizationOptions>(Options =>
    {
      Options.DefaultRequestCulture = new <pre> Microsoft.AspNetCore.Localization.RequestCulture("en-GB");
               Options.SupportedCultures = new List<CultureInfo> { new CultureInfo("en-GB") };
    }

    //All other configuration options
  }

  public void Configure(IApplicationBuilder app, IHostingEnvironment env)
  {
    if(env.IsDevelopment())
    {
      //Set Dev Env
    }
    else
    {
      //Set Live Env
    }

    app.UseRequestLocalization();
    app.UseMVc(routes =>
    {
      routes.MapRoute(
                   name: "default",
                   template: "{controller}/{action=Index}/{id?}");
    }
  }
}

Now if I test locally using Visual Studio it will only accept UK Dateformats which is what is required. But if I deploy to our test environment, it will only accept US Dateformats which is something that I am trying to remove.

Can anyone point me in the right direction as I feel I have tried all of the obvious to me!

I have also ensured that the webserver being deployed to has United Kingdom as its locations and region etc.

Thanks
Simon

What I have tried:

All of the above is where I got it too.