(1) In this section -
'Act of 2021' means the Affordable Housing Act 2021;
'cost rental dwelling' has the same meaning as it has in Part 3 of the Act of 2021;
'qualifying date', in relation to a relevant residential unit, means the date on which the unit becomes a qualifying relevant residential unit;
'qualifying relevant residential unit' has the meaning assigned to it by subsection (3);
'relevant instrument' means an instrument executed on or after 20 May 2021 that has been stamped in accordance with -
(a) paragraph (1)(b) of the heading in Schedule 1 titled 'CONVEYANCE or TRANSFER on sale of any property other than stocks or marketable securities or a policy of insurance or a policy of life insurance', or
(b) paragraph (3)(a)(i)(II) of the heading in Schedule 1 titled 'LEASE',
where the instrument was chargeable, in respect of the whole or part of the consideration under the instrument, to stamp duty at a rate of 10 per cent;
'relevant residential unit' has the same meaning as