Where a lease is varied so as to reduce the amount of the rent, the variation is treated for the purposes of this Act as an acquisition of a chargeable interest by the tenant.

Where any consideration in money or money's worth (other than an increase in rent) is given by the tenant for any variation of a lease, other than a variation of the amount of the rent or of the term of the lease, the variation is treated for the purposes of this Act as an acquisition of a chargeable interest by the tenant.

Where a lease is varied so as to reduce the term, the variation is treated for the purposes of this Act as an acquisition of a chargeable interest by the landlord.