1. All notices and other communications by the Society or a service provider which are required to be given to a participant under [Consolidated Requirements Part 2 > General Operational Matters > Central Accounting] shall for all purposes be treated as effectively given if left at or sent by post to the address from time to time notified to the Society or the service provider in question by that participant as the address to which notices and other communications are to be sent or, if given by telex or facsimile transmission, by submitting it to such number from time to time notified to the Society or the service provider in question as appropriate by that participant.
2. Any notice or communication sent to a participant by internal or ordinary post shall be treated as having been effectively given by properly addressing and posting (and, in the case of ordinary post, prepaying) a letter containing that notice or communication and shall be deemed to have been served 24 hours after the letter is posted. Any notice or communication sent by telex or facsimile transmission shall be deemed to have been received when evidence of its receipt is transmitted to the person sending it and any notice or communication sent by electronic means shall be deemed to have been received when transmitted.