In sections 6 to 11 of this Act, except so far as the context otherwise requires—
" breath test " means a test for the purpose of obtaining an indication of the proportion of alcohol in a person's blood carried out by means of a device of a type approved for the purpose of such a test by the Secretary of State, on a specimen of breath provided by that person;
" fail ", in relation to providing a specimen, includes refuse and " failure " shall be construed accordingly ;
" hospital " means an institution which provides medical or surgical treatment for in-patients or out-patients ;
" laboratory test " means the analysis of a specimen provided for the purpose ;
" the prescribed limit " means 80 milligrammes of alcohol in 100 millilitres of blood or such other proportion as may be prescribed by regulations made by the Secretary of State.
A person shall be treated for the purposes of sections 6 and 9 of this Act as providing a specimen of blood if, but only if, he consents to the specimen being taken by a medical practitioner and it is so taken and shall be treated for those purposes as providing it at the time it is so taken.
References in sections 8, 9 and 11 of this Act to providing a specimen of breath for a breath test are references to providing a specimen thereof in sufficient quantity to enable that test to be carried out.
For the purposes of the said section 6 and this section 107 milligrammes of alcohol in 100 millilitres of urine shall be treated as equivalent to 80 milligrammes of alcohol in 100 millilitres of blood, and the power conferred by subsection (1) above to prescribe some other proportion of alcohol in the blood shall include power to prescribe a proportion of alcohol in urine which is to be treated as equivalent to the prescribed proportion of alcohol in the blood.