A day in a chargeable period is relievable in relation to a single-dwelling interest if on that day—
a person carrying on a property trading business is entitled to the interest, and
the interest is held as stock of the business and for the sole purpose of resale in the course of the business.
A single-dwelling interest in a dwelling is taken not to be held for the sole purpose of resale in the course of a property trading business at any time when a non-qualifying individual is permitted to occupy the dwelling.
In this Part "property trading business" means a business that—
consists of or includes activities in the nature of a trade of buying and selling dwellings, and
is carried on on a commercial basis and with a view to profit.