"Subject to the following provisions of this section except where the context otherwise requires, development means the carrying out of building, engineering, mining or other operations in, on, over or under land or the making of any material change in the use of any buildings or other land."
"The following operations or uses of land shall not be taken for the purposes of this Act to involve development of the land: (a) the carrying out for the maintainance, improvement or other alteration of any building of works which -- (1) affect only the interior of the building; or (2) do not materially affect the external appearance of the building."
"In the case of buildings or other land which are used for a purpose of any class specified in an order made by the Secretary of State under this section, the use of the buildings or other land or subject to the provisions of the order of any part of the buildings or the other land, for any other purpose of the same class."
"Subject to the provisions of this order where a building or other land is used for the purpose of any class specified in the schedule, the use of that building or that other land for any other purpose of the same class shall not be taken to involve development of the land."
"The appellants challenge the Secretary of State's decision about there having been a material change in the use of the appeal site. In his decision letter he had given two reasons for saying that there had been such a change in use. The first was that the processes carried out on the open land are not dependent at all on any use of the industrial buildings. Accordingly, so far as such processes were new ones, the use could not be regarded as falling within Class IV of the Use Classes Order since they were not 'a use as a general industrial building'. The new processes were development within section 22(1) of the 1971 Act but as they were not dependent at all on any use of the industrial buildings, they did not attract the benefit of 22(2)(f) which excludes from the definition of development in section 22(1) any uses 'in the case of buildings or other land which are used for a purpose of any class specified in an order made by the Secretary of State under this section, the use for any other purpose of the same class'. New processes within Class IV carried on inside the buildings would have been permissible under section 22(2)(f) but new ones carried on outside were not. The second reason was that on the evidence there had been a material change of the use of the whole block making site by the introduction of a materially different working procedure together with the intensification of the potential and capacity of the plant."
"When the construction which we have adjudged to be correct is applied to the inspector's findings of fact, the result must be that during the Sturtevant [that is the period when part of the processes were brought into operation] occupation of the appeal site, the part of the block making site in the open was used for the same purpose as the shed in which the concrete block making machinery was installed. The blocks produced in the shed were dried in the open on concrete strips set in hoggin. This is all part of the block making process. The whole block making site was a 'general industrial building' for the purposes of the Use Classes Order, and as long as the appellants confined their operations on their site to Class IV uses, they were entitled to the benefit of section 22(2)(f) even though any new processes and intensification of use amounted to a material change of use."
"In the case of an use falling within the UCO [Use Classes Order], the doctrine of intensification is qualified by the wording of the order. Despite a process of intensification which could normally constitute development, there will be no development involved if the intensified use is still within the same class as the former use."
"The planning merits of the operation . . . are not relevant to the consideration of purely legal issues which are involved."
"The Council, commenting that the amount of sale space is in fact unspecified, reasonably say that in theory it could be doubled and contend then such an increase would go directly to the character of the store. The contention as to the character of the store, however, is not substantiated and a number of significant concessions are made. The Council’s witness acknowledged, for example, that the premises with a mezzanine would remain a superstore/hypermarket and that the primary use of the planning unit, which would continue as a single unit, would also remain as a Class A1 shop. Further, this would be so whatever the actual split between sales and associated back up space. I do not disagree. In summary, and as a matter of fact and degree, I conclude that there would be no material change of use."
"Considerations which are relevant are planning considerations, and the persons concerned in determining whether there was a material change of use would have to consider such matters as the development plan for the area, the declared policy of the planning authority, the circumstances in which the permission was granted and the terms of the permission. I do not think it right on the material that we have got to express a concluded opinion on the matter, although I would agree with Danckwarts LJ on the material available at present to us, that if the occupation of this cottage, after it had been occupied by a bona fide agricultural worker changed to that of a commuter or other person not engaged in agriculture, that would be a material change of use. However, that is a matter which, as I say, I do not think I can properly decide."