(1) An offer to settle a claim for damages must state whether or not the amount offered includes interest or costs.
(2) If the offer covers interest or costs it must state the amount which is included for each.
(3) If there is a counterclaim as well as a claim, the offer must state in the case of an offer by the —
(a) claimant – whether or not it takes into account the counterclaim; or
(b) defendant – whether or not it takes into account the claim,
and in each case in what amount.