In estimating the best rent or reservation in the nature of rent of land comprised in a farm business tenancy for the purposes of a relevant instrument, it shall not be necessary to take into account against the tenant any increase in the value of that land arising from any tenant’s improvements.

In subsection (1) above—

• “a relevant instrument” means any Act of Parliament, deed or other instrument which authorises a lease to be made on the condition that the best rent or reservation in the nature of rent is reserved;

• “tenant’s improvement” has the meaning given by section 15 of this Act.