"25. If the ordinary rules of offer and acceptance apply in the present context, the first defendants' counter-offer (which would normally be interpreted as meaning 'We reject your 50-50 offer but we offer you a 1:2 split of liability instead') would be readily interpreted as a rejection of the third defendants' offer (see Hyde v Wrench (1840) 3 Beav 334, 337 ... 26. Similarly, it is so well known that the risks inherent on litigation may alter significantly, particularly if an appeal court has pre-read the papers, as soon as a hearing starts and the judge or judges start to get engaged with the issues, that there would be a strong case for saying that there was an implied term of the offer that it was only open for acceptance (so long as one or other of the conditions inCPR 36.12 (2) were fulfilled) until the time when the appeal was opened in court at the hearing. 27. But in our judgment it is unnecessary to decide this application on either of these grounds, strong though each of them appears to be. It would be better to postpone any decision on these matters until a case in which they do arise for decision, and to give the Rules Committee a chance to consider them without being constrained by a definitive ruling of the court in either regard."
"30. One reason why we are not deciding this application on the ground that the counter-offer represented a rejection of the original offer (as it would in a straightforward contractual context) is that it might be considered unjust for one party's late offer to be susceptible of acceptance (so long as one of the conditions inCPR 36.12 (2) was fulfilled) right up to the time of the hearing whereas the other party's late offer was not susceptible of acceptance from the time of the counter-offer simply because it was made first in time. The making of both offers could convey with them adverse costs consequences to the side which did not accept, and in those circumstances it might appear just for each of them to be theoretically open for acceptance until the hearing starts. It would, as we have said, be far better if the Rules Committee reviewed this matter and came to a clear conclusion on how the scheme should operate in these circumstances."
"(1) A Part 36 offer is accepted by serving written notice of the acceptance on the offeror. (2) Subject to rule 36.9(3), a Part 36 offer may be accepted at any time (whether or not the offeree has subsequently made a different offer) unless the offeror serves notice of withdrawal on the offeree. (3) The court's permission is required to accept a Part 36 offer where – 26. …(d) the trial has started (4) Where the court gives permission under paragraph (3), unless all the parties have agreed costs, the court will make an order dealing with costs, and may order that the costs consequences set out in rule 36.10 will apply."