(1)This section applies if a farmer—
(a)keeps a production herd of a particular class, and
(b)ceases altogether to keep herds of that class for a period of at least 5 years.
(2)If the farmer keeps a production herd of that class after the end of that period—
(a)the period of account in which the farmer starts to keep the herd is treated as the first period of account in which the farmer keeps a production herd of that class, and
(b)any herd basis election previously made by the farmer in relation to production herds of that class ceases to have effect.