87.—(1) Where a landlord refuses or fails to execute repairs to a tenement which he is bound by covenant or otherwise by law to execute and has been called upon by the tenant to execute, and the tenant executes the repairs at his own expense, the tenant may set off the expenditure against any subsequent gale or gales of rent until it is recouped.

(2) Where a set-off is made under this section against the whole or part of a gale of rent, the landlord entitled to receive the rent shall on receiving evidence of the expenditure of the amount so set off, be bound to give the like receipt for the gale of rent as he would be bound to give if the gale or part of the gale had been paid in money.