Comments: There is an entry in the GRO indices for the birth of a "Sidney Arthur Leech", Apr/May/Jun 1893 in Lambeth, Greater London (volume 1d page 513) which could be a possible match.
Aged 8 at the time of the 1891 census, his birthplace is recorded as Herne Hill. Here his name is spelt Sidney rather than Sydney.
Aged 18 at the time of the 1901 census, where his occupation is now carpenter, and his other details are consistent with the earlier census, with the exception of his forename which is spelt Sydney.
Parents: Sydney Albert Leach, Alice Albrough Humphrey