You could try this, just a hunch, as it is the getIndex function that i responsible for returning the final value.

public function getIndex()
{
    $auth_return = $this->authorise('members.view');
    return $auth_return;
}

protected function authorise($permission)
{
    ....
    ....
    // If not authorised
   return redirect('/');
}

@haxzorer - Thanks for the reply. The issue is I want to return only if the user is not authorised, otherwise the index method will execute normally.

public function getIndex()
{
    $auth_return = $this->authorise('members.view');
    if(!$auth_return){    
        redirect('/');
    }
}

protected function authorise($permission)
{
    ....
    // if authorized
    return true;
    ....
    // If not authorised
   return false;
}