5. As soon as reasonably practicable after the Secretary of State has complied with section 4(4) of the Act, the monitoring authority must assign all landfill allowances allocated to a waste disposal authority under that section—
(a)to the waste disposal authority’s landfill allowance account;
(b)a unique reference number (which may include any letter) from which the following information may be ascertained—
(i)the waste disposal authority to which the allowance is allocated,
(ii)the year for which the allowance is allocated,
(iii)the vintage of the allowance for that year.