137.—(1) The elected council or a joint body may at any time by resoluti16on require the F207[chief executive] for the local authority or joint body concerned to prepare and submit to the elected council or joint body, as the case may be—

(a) plans and specifications for the execution of any particular work specified in the resolution which can lawfully be executed by the local authority or joint body, and

(b) an estimate of the probable cost of the execution of such work.

(2) Whenever the elected council or joint body passes a resolution to which subsection (1) relates, the F207[chief executive] concerned shall, as soon as conveniently may be, prepare and submit to the elected council or joint body, plans and specifications and an estimate in accordance with the resolution.