Presumption of corruption in certain cases

(1) Where in any proceedings against a person for an offence under Part IV, it is proved that an advantage has been paid or given to or received by a public servant by or from a person or agent of a person who has or had a material interest in the performance by that public servant of a function of his or her office or position, that advantage shall be deemed to have been paid or given and received corruptly as an inducement or reward unless the contrary is proved. (2) For the purposes of subsection (1) of this section, a person has a material interest in the performance by a public servant of a function of his or her office or position if the consequence or effect, (a) of the performance of that function; or (b) of any decision made in relation to or in the course or as a result of the performance of such a function, may be to confer on or withhold from the person a significant benefit (including the award or grant of a contract, licence, permission, designation or any other valuable benefit or advantage), without also conferring it on or withholding it from persons in general or a class of persons which is of significant size having regard to all the circumstances and of which the person is a member.