(1) An offer to settle must be in writing.
(2) The offeror must serve the offer on the offeree and a copy on all other parties.
(3) Neither the fact nor the amount of the offer or any payment into court in support of the offer must be communicated to the court before all questions of liability and the amount of money to be awarded (other than costs and interest) have been decided.
(4) Paragraph (3) does not apply to an offer which has been accepted or where a defence of tender before claim has been pleaded.