9. In paragraph 10 (which confers power to make regulations about the manner in which weekly income is to be determined), for sub-paragraph (2) substitute—
“(2) The regulations may, in particular—
(a)provide for determination in prescribed circumstances by reference to income of a prescribed description in a prescribed past period;
(b)provide for the Department to estimate any income or make an assumption as to any fact where, in its view, the information at its disposal is unreliable or insufficient, or relates to an atypical period in the life of the non-resident parent.”.