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The National Register was taken in September 1939 in order to understand the number of people to feed as well as the number of men eligible for conscription.
This register was updated until 1991, so any marriages would be recorded with the new surname. The surname in 1939 is shown in brackets.
There was a big incentive to register correctly as you could not get a Ration Book without it. So it is considered one of the most correct censuses.
At present it does not show people currently under 100, ie those born after 1915, unless they died before 1991.
Whilst at the time of writing this (Nov 2015) the records are expensive to buy the complete household costing c £5-6 each, there is still a lot to be found from the index search data.
This has been extracted and sorted by alphabetic first name, and then another index by location, which has more chance of bringing together members of families. You can access these indexes below, as extracted from Find My Past.