Nothing in this Part of this Act with respect to building regulations, and nothing in any building regulations, applies in relation to—
a building required for the purposes of a school or other educational establishment erected or to be erected according to
plans that have been approved by the appropriate national authority,
particulars submitted and approved under regulations made under section 544 of the Education Act 1996,
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a building belonging to statutory undertakers, the United Kingdom Atomic Energy Authority . . . or the Civil Aviation Authority and held or used by them for the purposes of their undertaking, unless it is—
a house, . . . or
a building used as offices or showrooms, and not forming part of a railway station ... ...
The words "the United Kingdom Atomic Energy Authority," in subsection (1)(b) above (together with paragraph 4 of Schedule 6 to this Act) cease to have effect upon the coming into force of the repeal of section 5(5) of the Atomic Energy Authority Act 1954 contained in Schedule 7 to this Act.