(1) The assessors may request the claimant to furnish to them such information or documents in the possession or control of the claimant, additional to the information contained in, or the documents which accompanied, his or her application under section 11, as they consider necessary for the making of the assessment.

(2) The assessors may request the respondent or respondents to furnish to them such information or documents in the possession or control of the respondent or respondents as the assessors consider necessary for the making of the assessment.

(3) If retained experts are assisting the assessors in the making of the assessment the assessors may make the following request if they consider that it is necessary to do so for the purpose of enabling those experts to assist them in the making of the assessment.

(4) That request is a request of the claimant or the respondent or respondents to -

(a) provide such assistance to the retained experts,