Page "London postal district" Paragraph 5
from
Wikipedia
In 1866 NE was merged into the E district, transferring places such as Walthamstow, Wanstead and Leytonstone.
Also at this time the outer boundary was retracted in the east, removing places such as Great Ilford from the postal district altogether.
The NE and S codes have been re-used in the national postcode system and now refer to the NE postcode area around Newcastle upon Tyne and the S postcode area around Sheffield.
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