(1) It shall be the duty of the Board to ensure that assessments in respect of relevant claims are made as expeditiously as may be and, for that purpose, to take all such steps as are open to it to ensure that, in so far as is practicable, there are no avoidable delays at any stage in the making of assessments.
(2) In particular, and without prejudice to the generality of subsection (1), it shall, subject to subsection (4), be the duty of the Board to ensure that every assessment is made within a period of 9 months beginning on (without prejudice to subsection (3)) -
(a) if there is only one respondent as respects the relevant claim concerned, the date on which it receives the respondent's consent to an assessment being made under section 20 in relation to that claim,
(b) if there are 2 or more respondents as respects the relevant claim concerned -
(i) where only one of them consents to such an assessment being made in relation to that claim (irrespective of whether there is a failure
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