This Article applies where a tenant under a controlled tenancy has paid rent in excess of the rent limit for any rental period under that tenancy.

The tenant shall be entitled to recover from the landlord who received the rent, or his personal representatives, any sum by which the amount paid exceeded the rent limit.

Without prejudice to any other method of recovery, the tenant shall be entitled to recoup that sum by deducting it from any rent payable by him to the landlord.

But no sum may be recouped by a tenant under paragraph (3) at any time after the expiry of 2 years from the date of payment.