33. Notwithstanding the temporary closure or diversion of any street under the powers of article 11 (temporary closure of public rights of way), National Grid will be at liberty at all times to take all necessary access across any such closed street and/or to execute and do all such works and things in, upon or under any such street as may be reasonably necessary or desirable to enable it to maintain any apparatus which at the time of the closure or diversion was in that street.