'5 Appeals against assessment of extent of disablement (1) Where, in the case of any such claim as is referred to in section one, section two or section three of this Act in respect of the disablement of any person, the Minister makes an interim assessment of the degree of the disablement, he shall notify the claimant thereof and an appeal shall lie to the appropriate tribunal from the interim assessment and from any subsequent interim assessment, and the appropriate tribunal on any such appeal may uphold the Minister's assessment or may alter the assessment in one or both of the following ways, namely- (a) by increasing or reducing the degree of disablement it specifies; and (b) by reducing the period for which the assessment is to be in force. In this section the expression "interim assessment" means any assessment other than such a final assessment as is referred to in the next following subsection.'
'42 Determination of degree of disablement (1) The following provisions of this article shall apply for the purposes of the assessment of the degree of the disablement of a member of the armed forces due to service before6th April 2005 . (2) Subject to the following provisions of this article- (a) the degree of the disablement due to service of a member of the armed forces shall be assessed by making a comparison between the condition of the member as so disabled and the condition of a normal healthy person of the same age and sex, without taking into account the earning capacity of the member in his disabled condition in his own or any other specific trade or occupation, and without taking into account the effect of any individual factors or extraneous circumstances; (b) for the purpose of assessing the degree of disablement due to an injury which existed before or arose during service and has been and remains aggravated thereby- (i) in assessing the degree of disablement existing at the date of the termination of the service of the member, account shall be taken of the total disablement due to that injury and existing at that date, and (ii) in assessing the degree of disablement existing at any date subsequent to the date of the termination of his service, any increase in the degree of disablement which has occurred since the said date of termination shall only be taken into account in so far as that increase is due to the aggravation by service of that injury; (c) where such disablement is due to more than one injury, a composite assessment of the degree of disablement shall be made by reference to the combined effect of all such injuries; (d) the degree of disablement shall be assessed on an interim basis unless the member's condition permits a final assessment of the extent, if any, of that disablement. (5) The degree of disablement assessed under the foregoing provisions of this article shall be certified by way of a percentage, total disablement being represented by 100 per cent (which shall be the maximum assessment) and a lesser degree being represented by such percentage as bears to 100 per cent the same proportion as the lesser degree of disablement bears to total disablement, so however that a degree of disablement of 20 per cent or more shall be certified at a percentage which is a multiple of 10, and a degree of disablement which is less than 20 per cent shall, except in a case to which Table 1 of Part III of Schedule 1 applies, be certified in a manner suitable for the purposes of Table 2 of Part III of that Schedule. (6) Where a disablement is due to an injury specified in Part V of Schedule 1 or is a disablement so specified, and, in either case, has reached a settled condition, the degree of that disablement shall, in the absence of any special features, be certified for the purposes of this article at the percentage specified in that Part as appropriate to that injury or to that disablement. (13) Where- (a) a member has sustained a minor injury specified in Table 1 of Part III of Schedule 1 as well as some other disablement due to service the degree of which is less than 100 per cent; and (b) a composite assessment of the degree of the disablement from both causes is no higher than the assessment for the other disablement alone this article shall have effect so as to authorise an award under article 7 in respect of the minor injury as well as an award under article 6 or 7 in respect of the other disablement. (14) The degree of disablement certified under this article shall be the degree of disablement for the purposes of any award made under this Order.'
'(3) In particular, and without restricting the general powers in paragraphs (1) and (2), the Upper Tribunal may- … (n) require any other tribunal whose decision is the subject of proceedings before the Upper Tribunal to provide reasons for the decision, or other information or documents in relation to the decision or the proceedings in that tribunal.'