Hi, Ernie!
Here are all the Harold Lewins from Ancestry's link to the BMD. Don't know if it will be any help, but ... The 4th one down is in the same registration district as the Census (taken on the night of 31 March 1901).
Kind regards,
BB
A collection of indexes to Birth, Marriage, and Death records for England and Wales, between 1837 and 1983.
Name Year Quarter District County Volume Page:
Lewin, Douglas Harold S 1901 June Lambeth Greater London London Surrey 1d 500
LEWIN, Edward Harold 1902 March Derby Derbyshire 7b 573
Lewin, Edward Harold 1905 March Islington Greater London London Middlesex 1b 266
Lewin, Harold 1901 March Wirral (1837-1974) Cheshire 8a 431
Lewin, Harold 1906 June West Derby Lancashire 8b 704
Lewin, Harold Henry 1905 March Islington Greater London London Middlesex 1b 181
LEWIN, Harold William 1904 September Chelmsford Essex 4a 710
Lewin, Herbert Harold 1903 September Barrow upon Soar Leicestershire 7a 164
Lewin, Leslie Harold 1904 December Barrow upon Soar Leicestershire 7a 153
Lewin, Percy Harold 1900 September Wandsworth London Surrey 1d 1096