41.—(1) Without prejudice to the powers conferred on them by F440[this Part and Part XXI] to grant a permission to develop land for a limited period only, in deciding to grant a permission under F440[section 34, 37, 37G, 37N or 293], a planning authority or the Board, as may be appropriate, may, having regard to the nature and extent of the relevant development and any other material consideration, specify the period during which the permission is to have effect, being a period—

(a) in the case of all development requiring permission, of not less than 2 years, and

(b) in the case of residential development requiring permission, of not more than 10 years,

and where the planning authority or the Board exercises, or refuses to exercise, the power conferred on it by this section, the exercise or refusal shall be regarded as forming part of the relevant decision of the authority or the Board under F440[section 34, 37, 37G, 37N or 293].

(2) Where an application for permission relates to a residential development comprising 10 or more houses—

(a) material considerations in subsection (1) may include any information available to the planning authority or furnished to it by the applicant concerning implementation by the applicant of any housing development in the previous 5 years, and

(b) an assessment by the planning authority of the likelihood of the proposed development being implemented within the appropriate period sought, being the appropriate period within the meaning provided for by section 40(3).]