No managing trustees of property whereof the diocesan authority is the custodian trustee pursuant to the provisions of this Measure shall sell, lease, let, exchange, charge or take any legal proceedings in relation thereto without the consent of the diocesan authority or, in the case of legal proceedings, of the agent of the diocesan authority authorised in that behalf, in addition to any other consents or orders required by law either from the Charity Commissioners or otherwise.