(1) Where a person, who is not a specified person, is alleged to have committed an offence under section 4(2), (3) or (4) or section 5(2), (3) or (4) and the concentration of alcohol purported to be present in his or her body as stated in accordance with section 13 or certified in accordance with section 17-

(a) did not exceed-

(i) 80 milligrammes of alcohol per 100 millilitres of blood,

(ii) 107 milligrammes of alcohol per 100 millilitres of urine,

(iii) 35 microgrammes of alcohol per 100 millilitres of breath,

or

(b) exceeded-

(i) 80 milligrammes but did not exceed 100 milligrammes of alcohol per 100 millilitres of blood,

(ii) 107 milligrammes but did not exceed 135 milligrammes of alcohol per 100 millilitres of urine, or

(iii) 35 microgrammes but did not exceed 44 microgrammes of alcohol per 100 millilitres of breath,