Provided that an aircraft which is registered under the law of any foreign nation as an aircraft belonging to that nation shall not also be registered as a British aircraft. (2) Regulations under this section may provide for— (_a_) the appointment and duties of registrars; (_b_) the keeping of registers and the particulars to be entered therein; (_c_) the procedure for obtaining the registration of aircraft by the owners thereof, including the evidence to be produced as to the qualifications of applicants; (_d_) the issue, form, custody, and delivery up of certificates of registration; (_e_) the transfer and transmission of British aircraft; (_f_) the fees to be paid; (_g_) the application with the necessary modifications for any of the purposes aforesaid of any of the provisions contained in sections twenty to twenty-two, twenty-five, twenty-seven to thirty, thirty-nine to forty-six (except so far as those sections relate to mortgages), forty-eight to fifty-three, fifty-six, fifty-seven, sixty, sixty-one, and sixty-four of the Merchant Shipping Act, 1894. (3) If an aircraft required under this Act to be registered is not so registered it shall not be recognised as a British aircraft, and shall not be entitled to any of the benefits, privileges, or advantages, or protection enjoyed by British aircraft, nor to assume the British national character, but so far as regards the payment of dues, the liability to fines and forfeitures, and the punishment of offences committed on such aircraft, or by any person belonging to it, such aircraft shall be dealt with in the same manner in all respects as if she were a recognised British aircraft. (4) If any person required under the regulations to deliver up a certificate of registration fails to do so, he shall be guilty of an offence under this Act. (5) If the owner or pilot of an aircraft uses or attempts to use a certificate of registry not legally granted in respect of the aircraft, he shall in respect of each offence be guilty of a misdemeanour. CERTIFICATION OF AIRWORTHINESS 4—(1) An aircraft (if not exempted from the provisions of this section by the regulations made thereunder) shall not be navigated unless its airworthiness has been certified in accordance with regulations made by the Board of Trade and the certificate of airworthiness in respect thereof is for the time being in force. (2) The regulations of the Board of Trade under this section may, amongst other things— (_a_) prescribe the conditions to be fulfilled (including the equipment to be carried) and the tests to be applied in determining airworthiness; (_b_) provide for the conduct on behalf of the Board of Trade by other bodies of tests and examinations of aircraft; (_c_) provide for the issue form, custody, and delivery up of certificates of airworthiness;