Execution by Secretary of State of works in default
16. If, on the expiration of 30 days from the date when a notice under article 8(2)(a) or 10(1) is served upon the undertaker it has failed, without reasonable excuse, to comply with the requirements of the notice, the Secretary of State may execute the works specified in the notice; and any expenditure incurred by the Secretary of State in so doing will be recoverable from the undertaker.