56.—(1) This article applies for the purpose of determining the value of “BH” in the formula in article 55(2).
(2) Where the ECO4 project includes one or more basic heating repair or replacement measures, “BH” is the sum of the determined cost savings for those measures.
(3) Where the ECO4 project does not include any basic heating repair or replacement measures, “BH” is £0.