9E+WEnabling the arbitrator, on an arbitration under this Act relating to such a notice as is mentioned in paragraph 8 above, to modify the notice—
(a)by deleting any item or part of an item of work specified in the notice as to which, having due regard to the interests of good husbandry as respects the agricultural holding to which the notice relates and of sound management of the estate of which that holding forms part or which that holding constitutes, the arbitrator is satisfied that it is unnecessary or unjustified, or
(b)by substituting, in the case of any item or part of an item of work so specified, a different method or material for the method or material which the notice would otherwise require to be followed or used where, having regard to the purpose which that item or part is intended to achieve, the arbitrator is satisfied that—
(i)the last-mentioned method or material would involve undue difficulty or expense,
(ii)the first-mentioned method or material would be substantially as effective for the purpose, and
(iii)in all the circumstances the substitution is justified.