Hi Alex,

Thanks for quick response - as you suggested I added a separate controller and made this the default controller. Including my code here for future reference!

public class AuthorisedUmbracoController : RenderMvcController
{

    public override ActionResult Index(RenderModel model)
    {
        var ticket = new System.Web.HttpContextWrapper(System.Web.HttpContext.Current).GetUmbracoAuthTicket();

        if (ticket != null)
        {
            var current = ApplicationContext.Services.UserService.GetByUsername(ticket.Name);

            return base.Index(model);
        }

        //get return URL, check local
        var returnUrl = Request.Url.PathAndQuery; // assuming deployed at root)

        if (!Url.IsLocalUrl(returnUrl))
        {
            returnUrl = "/umbraco"; //login screen
        }

        return new RedirectResult("/umbraco#/login/false?returnPath=" + returnUrl, false);
    }
}

The following sets the new controller as the default.

public class ApplicationStartingEventHandler : ApplicationEventHandler
{
    protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        DefaultRenderMvcControllerResolver.Current.SetDefaultControllerType(typeof(AuthorisedUmbracoController));
    }
}

Thanks for your help!