reg 8 Allowances to witnesses, other than professional or expert, and to others for attendance
(1) Any of the persons mentioned in paragraph (2) below whose attendance causes him — (a) to incur any expenditure (other than on travelling, lodging or subsistence) to which he would not otherwise be subject; or (b) to suffer any loss of earnings, or of benefit under the enactments relating to National Insurance, which he would otherwise have received, shall be entitled to receive a financial loss allowance of an amount equal to the actual expenditure incurred or loss suffered not exceeding any relevant amount in respect of that expense or loss. (2) The persons referred to in paragraph (1) above are — (a) a witness who attends to give evidence (other than professional or expert evidence); and (b) any other person who, in the opinion of the appropriate officer, necessarily attends for the purpose of the prosecution case otherwise than to give evidence (excluding an interpreter).