// BEFORE WE CAN SAVE THIS CHANGE, WE MUST CONFIRM WE CAN ACTUALLY DO THIS SAFELY
        $errors = array();

        // 1. We have no planned rota shifts (shouldn't happen if they're leaving right?)
        $planned_shifts = Database::getRepository("Staff:ModelRotaEntry")
            ->countAfterDateForStaffMember($staff, $perform_changes_at);
        if($planned_shifts > 0)
            $errors[] = "User has planned rota shifts after leaving date.";

        // 2. We have no worked rota shifts (would not get paid!)
        $worked_shifts = Database::getRepository("Reports:ModelDailyReportRotaEntry")
            ->countAfterDateForStaffMember($staff, $perform_changes_at);
        if($worked_shifts > 0)
            $errors[] = "User has worked rota shifts after leaving date.";

        // 3. We have no planned holiday (would be processed)
        $planned_holiday = Database::getRepository("Staff:ModelHoliday")
            ->countAfterDateForStaffMember($staff, $perform_changes_at);
        if($planned_holiday > 0)
            $errors[] = "User has planned rota shifts after leaving date.";

        // 4. We have no upcoming scheduled updates (these could reactivate the user)
        $scheduled_updates = Database::getRepository("Staff:ModelScheduledUpdate")
            ->countAfterDateForStaffMember($staff, $perform_changes_at);
        if($scheduled_updates > 0)
            $errors[] = "User has scheduled updates after leaving date.";

        if(count($errors)) {
            $error_msg = "<strong>Unable to mark as left</strong><br/>" . join($errors, "<br/>");
            return Request::setResponseCode("error", $error_msg);
        }