3The enlargement, improvement or other alteration, as often as the person having the right to carry out such operations may desire, of any such building as is mentioned in paragraph 1(a) or (b) of this Schedule, or any building substituted for such a building by the carrying out of any such operations as are mentioned in that paragraph, so long as the cubic content of the original building is not increased or exceeded—
(a)in the case of a dwellinghouse, by more than one-tenth or 1,750 cubic feet, whichever is the greater; and
(b)in any other case, by more than one-tenth.
4The carrying out, on land which was used for the purposes of agriculture or forestry at a material date, of any building or other operations required for the purposes of that use, other than operations for the erection, enlargement, improvement or alteration of dwellinghouses or of buildings used for the purposes of market gardens, nursery grounds or timber yards or for other purposes not connected with general farming operations or with the cultivation or felling of trees.
5The winning and working, on land held or occupied with land used for the purposes of agriculture, of any minerals reasonably required for the purposes of that use, including the fertilisation of the land so used and the maintenance, improvement or alteration of buildings or works thereon which are occupied or used for those purposes.
6The winning and working of peat by any person for the domestic requirements of that person.
7In the case of a building or other land which, at a material date, was used for a purpose falling within any general class specified in an order made by the Secretary of State for the purposes of this paragraph, or which having been unoccupied on and at all times since the appointed day, was last used (otherwise than before 7th January 1937) for any such purpose, the use of that building or land for any other purpose falling within the same general class.
8In the case of any building or other land which, at a material date, was in the occupation of a person by whom it was used as to part only for a particular purpose, the use for that purpose of any additional pan of the building or land not exceeding one-tenth of the cubic content of the part of the building used for that purpose on the appointed day, or on the day thereafter when the building began to be so used, or, as the case may be, one-tenth of the area of the land so used on that day.
9The deposit of waste materials or refuse in connection with the working of minerals, on any land comprised in a site which at a material date was being used for that purpose, so far as may be reasonably required in connection with the working of those minerals.