1. Subject to paragraph 3, a greenhouse.
2. A building used, subject to paragraph 3, for agriculture, or a building principally for the keeping of animals, provided in each case that—
(a)no part of the building is used as a dwelling;
(b)no point of the building is less than one and a half times its height from any point of a building which contains sleeping accommodation; and
(c)the building is provided with a fire exit which is not more than 30 metres from any point in the building.
3. The descriptions of buildings in paragraphs 1 and 2 do not include a greenhouse or a building used for agriculture if the principal purpose for which they are used is retailing, packing or exhibiting.
4. In paragraph 2, “agriculture” includes horticulture, fruit growing, the growing of plants for seed and fish farming.