(1) In this section -
'basis period' has the same meaning as in section 127(1);
'construction operations', in relation to residential development land, means operations of any of the descriptions referred to in the definition of 'construction operations' in section 530(1) other than such operations as consist of -
(a) the demolition or dismantling of any building or structure on the land,
(b) the construction or demolition of any works forming part of the land, being roadworks, water mains, wells, sewers or installations for the purposes of land drainage, or
(c) any other operations which are preparatory to residential development on the land other than the laying of foundations for such development;
'residential development' includes any development which is ancillary to the development and which is necessary for the proper planning and development of the area in question;
'residential development land' means land -
(a) disposed of to -
(i) a housing authority (within the meaning of s
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