Where the whole or a substantial part of a production herd kept by a farmer for the purposes of his farming is slaughtered by the order of any Ministry, government department or local or public authority under the law relating to the diseases of animals in such circumstances that compensation is payable in respect of it, an election for the herd basis thereupon made by the farmer in relation to that herd and any other production herds of the same class so kept by him shall, subject to sub-paragraph (2) below, be valid notwithstanding that it is not made within the time required by paragraph 2(3) above.

An election for the herd basis made by virtue of sub-paragraph (1) above shall, subject to sub-paragraph (3) below, only be valid if made not later than two years after the end of the first chargeable period for which the tax chargeable on the farmer in respect of the profits or gains of his farming finally falls to be computed by reference to the facts of a period in which the compensation is relevant.

If that first chargeable period is the second year of assessment within the meaning of section 62 and notice is given under subsection (2) of that section, then for the purposes of income tax (but not corporation tax), the election shall be valid if made not later than the giving of that notice.

An election for the herd basis made by virtue of sub-paragraph (1) above shall, notwithstanding paragraph 2(4) above, have effect only for the chargeable period mentioned in sub-paragraph (2) above and subsequent chargeable periods except that for the purposes of income tax (but not corporation tax) the election shall have effect for earlier chargeable periods for the purposes of any claim under section 380 which is made by the farmer for relief in respect of his farming, if the relief falls to be computed wholly or partly by reference to the facts of a period in which the compensation is relevant.

For the purposes of this paragraph, compensation shall be deemed to be relevant in any period if, but only if, it falls (or would but for an election under this paragraph fall) to be taken into account as a trading receipt in computing the profits or gains or losses of that or an earlier period.