public function createUserGroup($name, $parentGroup = null)
    {
        if (!$parentGroup) {
            $parentGroup = $this->userService->loadUserGroup(self::USERGROUP_ROOT_CONTENT_ID);
        }

        $userGroupCreateStruct = $this->userService->newUserGroupCreateStruct('eng-GB');
        $userGroupCreateStruct->setField('name', $name);

        return $this->userService->createUserGroup($userGroupCreateStruct, $parentGroup);
    }