If a person to whom the overarching obligations apply cannot resolve a dispute wholly by agreement, the person must use reasonable endeavours to—
(a) resolve by agreement any issues in dispute which can be resolved in that way; and
(b) narrow the scope of the remaining issues in dispute—
unless—
(c) it is not in the interests of justice to do so; or
(d) the dispute is of such a nature that only judicial determination is appropriate.