Party of any proprietary interest, or any breach of either Party's obligations which could cause irreparable harm to the other Party; or 19.4.2 to bring proceedings intended to result in the enforcement of a settlement agreement or of a binding determination of a dispute between the Parties. 20 NOTICES 20.1 Except as otherwise expressly provided, any notice or other communication from either Party ("Sender") to the other Party ("Recipient") which is required to be given under this Agreement ("Notice") must be in writing (which for these purposes excludes e-mail), signed by or on behalf of the Sender, and be addressed to the officer of the Recipient whose details are set out in Clause 20.3 below. 20.2 The Sender may either: 20.2.1 deliver the Notice, or arrange for its delivery, by hand and retain satisfactory proof of delivery; or 20.2.2 send the Notice by fax and retain a successful fax transmission report recording the correct number of pages; or 20.2.3 send the Notice by recorded delivery or registered post and retain a receipt of delivery or sending; or 20.2.4 send the Notice by registered airmail if it is to be served by post outside the country from which it is sent and retain a receipt of sending. 20.3 The details of the Parties for the purpose of Notices are as follows: 16 Each Party may alter the above details that relate to it and shall promptly notify the other of any such change by a Notice in accordance with this Clause. 20.4 Any Notice shall be deemed to have been served: 20.4.1 if delivered by hand, at the time and date of delivery; 20.4.2 if sent by fax, at the time and date of the successful fax transmission report; 20.4.3 if sent by recorded delivery or registered post, 48 hours from