(1) Where the business address of a solicitor or of the agent of a solicitor given in accordance with Rule 6.06 or 8.06 is changed, the solicitor shall forthwith file notice of the change and serve a copy of the notice on every party.
(2) Upon the filing and service of notice in accordance with paragraph (1), the address for service of the party for whom the solicitor acts shall be the new business address of the solicitor or, if the business address of the agent of the solicitor is changed, the new business address of the agent, stated in the notice.
(3) If a solicitor required under paragraph (1) to file and serve notice does not do so, a document not required to be served personally on the party for whom the solicitor acts may, until notice is filed and served, be served on the party either at—
(a) the address given in accordance with Rule 6.06; or
(b) the new business address of the solicitor or of the agent, as the case may be.