72Valuation of agricultural dwelling-houses.
As from the first day of April, nineteen hundred and thirty, the gross value for rating purposes of a house occupied in connection with agricultural land and used as the dwelling-house of a person who—
(a)is primarily engaged in carrying on or directing agricultural operations on that land; or
(b)is employed in agricultural operations on that land in the service of the occupier thereof and is entitled, whether as tenant or otherwise, so to use the house only while so employed,
shall, so long as the house is so occupied and used, be estimated by reference to the rent at which the house might reasonably be expected to let from year to year if it could not be occupied and used otherwise than as aforesaid.