Paragraph 3
A tenancy entered into before the relevant date where there is, current on that date, a benefit period (within the meaning of regulation 66 of the Housing Benefit (General) Regulations 1987) relating to a claim for housing benefit in relation to the tenancy–
unless and until a change of circumstances takes effect (within the meaning of regulation 68 of those Regulations), provided it takes effect after 16th April 1989, or
until the benefit period ends (or, if it ends before 17th April 1989, the next benefit period ends).
In sub-paragraph (1) “relevant date” means–
except were (b) applies, 1st April 1989;
in the case of a tenancy where one of the occupiers of the dwelling immediately before 10 April 1989 is in receipt of income support under the Social Security Act 1986 and whose applicable amount immediately before that date is calculated in accordance with regulation 20 or regulation 71(1)(b) of, or paragraph 17 of Schedule 7 to, the Income Support (General) Regulations 1987f1, 10th April 1989.