Where, in the case of a service tenancy or of any other tenancy where the landlord is the employer of the tenant,—
(a)
the landlord, by agreement with the tenant or pursuant to or in accordance with any enactment, regularly deducts from the tenant’s pay for a standard pay period the amount of rent payable by the tenant for any standard rental period; and
(b)
no such regular deduction is such as to constitute a contravention of subsection (1); and
(c)
because of a forthcoming holiday period or for any other special reason, the landlord pays the tenant for a period longer than the standard pay period,—
the landlord may, notwithstanding subsection (1), deduct from the amount so paid the amount of rent payable by the tenant for any period longer than the standard rental period so long as the proportion of pay so deducted on account of rent does not exceed the proportion of pay regularly deducted.