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For Ground 15 in Schedule 5 to the Housing (Scotland) Act 1988 (eviction on ground of use of premises for immoral or illegal purposes etc.) there shall be substituted the following—
Ground 15 The tenant, a person residing or lodging in the house with the tenant or a person visiting the house has— (a) been convicted of— (i) using or allowing the house to be used for immoral or illegal purposes; or (ii) an offence punishable by imprisonment committed in, or in the locality of, the house; or (b) acted in an anti-social manner in relation to a person residing, visiting or otherwise engaging in lawful activity in the locality; or (c) pursued a course of anti-social conduct in relation to such a person as is mentioned in head (b) above.
No person shall be liable to eviction under paragraph 2 or 7 of Schedule 3 to the Housing (Scotland) Act 1987 or Ground 15 in Schedule 5 to the Housing (Scotland) Act 1988 as substituted respectively by subsection (2), (3) and (4) above in respect of any act or conduct before the commencement of this section unless he would have been liable to be evicted under those paragraphs or, as the case may be, that Ground as they had effect before that substitution.