I have the above mentioned in the family of Arthur John Denton on 1901 census with a birthdate of 1895 Kingsland Middlesex and described as son.
Arthur John Denton married Esther Cuthbert 1899 Poplar London
I cannot find a birth registration for Arthur T despite using various spellings etc. I have discounted the 1897 Kensington birth as it is a different family.
My suspicion is that he is the son of Arthur John's sister Charlotte who had 2 other children prior to her marriage to Arthur Primmeth 1903, both in Arthur's household in 1911 as Denton stepchildren
Dorothy Denton registered under mothers maiden name of Denton 1900
Ivy Denton registered under mothers maiden name of Elliss 1902
(Elliss is the maiden name of Charlotte's mother Emma, I think it unlikely Emma at 61 was the mother)
Perhaps there is no registration or baptism, but any help would be greatly appreciated
