The Distribution and Status of Rattus rattus L. in the United Kingdom in 1951 and 1956

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Abstract
Based on the replies to a questionnaire sent to all local authorities, it appears that in 1951 the ship (roof) rat was well established ashore in the London area and in about 40 localities outside it, and occurred sporadically in about 30 other places. By 1956 it had decreased in range and frequency in most localities and disappeared from some. The main factors responsible for its loss between 1951 and 1956 are thought to be the continuous reduction in the number of rats arriving in the ports in ocean-going vessels, the introduction of measures to reduce rat infestation in coastal vessels, improvements in dockside building construction, and improved methods of rat control on land.

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