Read with "interest" - Part 36 offers

In many cases it will be easy to determine whether a claimant has beaten their Part 36 offer and accordingly whether they are entitled to the additional benefits provided for under CPR 36.17(4). Sometimes, however, because of the interest accruing on damages between the date of the Part 36 offer and the judgment date, the judgment sum only exceeds the Part 36 offer by a small amount. If this happens, what are the consequences?