The expenses of an investigation under section 37B shall be defrayed in the first instance by the Certification Officer.
For the purposes of this section there shall be treated as expenses of an investigation, in particular, such reasonable sums as the Certification Officer may determine in respect of general staff costs and overheads.
A person who is convicted on a prosecution instituted as a result of the investigation may in the same proceedings be ordered to pay the expenses of the investigation to such extent as may be specified in the order.