1. The requirements which have to be satisfied in relation to a silo are that—
(a)it complies with the following provisions of this Schedule; or
(b)it is designed and constructed in accordance with the standard on cylindrical forage tower silos published by the British Standards Institution and numbered BS 5061: 1974(1).
The International Standard Book Number (ISBN) in respect of BS 5061: 1974 is 0 580 080706.