(1) Having made their assessment of a relevant claim the assessors shall reduce the assessment to writing and the Board shall serve the assessment on the claimant and the respondent or each of the respondents, together with the following notice.

(2) That notice is a notice requesting -

(a) in the case of a notice served on the claimant, the claimant to state to the Board in writing within 28 days, or such greater period as may be specified by rules under section 46, from the service of the notice whether he or she accepts the assessment, and

(b) in the case of a notice served on a respondent, the respondent to state to the Board in writing within 21 days from the service of the notice whether he or she accepts the assessment.

(3) If -