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An Oast House is a building used to dry fresh hops before they are sent to the brewers, to be used for flavouring beer. A typical Oast House consisted of the 'oast' and the 'stowage'. The oast was a kiln, with a plenum chamber fired by charcoal at ground floor and the drying floor directly above. The steep pitched roof channelled the hot air through the hops to the top. The stowage, was the barn section, it had a cooling floor and press at first floor and storage area at ground floor. …read more about Oast Houses Link

A listed building is a building or structure officially designated as being of special architectural, historical or cultural significance. There are over half a million listed buildings in the United Kingdom.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites.

There are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

…read more at wikipedia Link