Two round oasthouses attached at the eastern end of the building appear on the 1st ed.(1862-1875), 2nd ed. (1897-1900), 3rd (1906-1923) and 4th ed. (1906-1952) OS maps. The original conical rooves have been replaced with a mechanically draughted ventilated louvred roof post 1955. Note: Once electricity began to be introduced to the oast house, fans were used to drive air through the hops, which was easier to control than the traditional vacuum of air through the cowl this allowed a larger quantity of hops to be dried at one time. Some oast kilns were modified with louvred ventilators, to replaced the cowls which could not cope with the extra pressure. This example was called The "Watson" ventilator, designed in the 1960's