Это ж 1945 год - конец войны! За этим законом, кстати, последовал другой под таким же названием от 1948 года. И речь в них шла не о "реквизиции" ("национализации"), а о "дереквизиции", т.е. возврате тем собственникам, у которых отобрали в начале войны, либо об урегулировании вопросов о денежной компенсации.

After the end of the War, a number of provisions deriving from the requisitioning of land were made:

Requisitioned Land and War Works Acts 1945 and 1948
Town and Country Planning Act 1947
Agriculture Act 1947
Requisitioned Land and War Works (Compensation)Act: the Government Oil Pipe-Lines Regulations, 1948
Town and Country Planning Acts 1944 and 1948 (Registration of Orders and list of Buildings) Rules 1948
Land Powers (Defence) Act (Registration of Way-Leave Orders etc) Rules, 1958

During the later part of the Second World War, and after the War, the Ministry of Works dealt with the derequisitioning of property taken over for government use, as well as with compensation claims in respect of requisitioned property, the disposal of surplus buildings and stores, the removal of temporary defence works on private land and the restoration of the land. Requisitioned land on which development of permanent value had taken place was acquired formally, as were cross-country oil pipelines.

After the termination of hostilities, it was decided that some of the land requisitioned to increase food production should be retained for agricultural purposes, and under Part V of the Agriculture Act 1947 the Minister of Agriculture acquired powers to compel purchase of any requisitioned land which was not sold voluntarily to him, in order to maintain its full and efficient use for agriculture. Such land was then managed by the Agricultural Land Commission, set up under the Act, until it was decided that it was appropriate to dispose of the Ministry's interest in it.

http://www.nationalarchives.gov.uk/records/research-guides/r...

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Note added at 3 час (2012-10-06 19:35:59 GMT)
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В русскоязычной исторической литературе примеров названия этого закона не нашел, но исходя из того, что описано выше на сайте архивов Великобритании, наверное, лучше всего будет перевести:

Закон 1945 года о реквизированных землях и военных объектах, поскольку там были не только заводы, но и склады, и аэродромы, и много чего еще "военного".