These Regulations further amend the Rules of the Air 2007. The new rule prohibits test flying of aircraft over congested areas in cases where the aircraft does not have a valid certificate of airworthiness in force and either the aircraft, its engines or equipment are being tested or the aircraft is seeking to qualify for the issue or validation of a certificate of airworthiness. The prohibition does not apply where the CAA has given its permission for the flight. A correction to the numbering of Rule 58 is also made. An impact assessment has been carried out in respect of rule 24A. A copy of the assessment has been placed in the library of both Houses of Parliament. Copies may be obtained from the Department for Transport, 76 Marsham Street, London SW1P 4DR or from www.dft.gov.uk.