A maintenance plan must—
(a)specify the maintenance which requires to be carried out over the period during which the plan is to apply,
(b)specify—
(i)any steps to be taken for the purposes of carrying out that maintenance (including any steps to be taken where anything to be maintained under the plan requires to be repaired or replaced), and
(ii)when any such steps are to be taken, and
(c)set out an estimate of the costs likely to be incurred in implementing the plan.