The following census extracts are relevant:
WHITNEY
1901MDX-1261/7/3 William (27) gn.lab, Alice (27) +2
1911HRT-Cheshunt, Sch 277, Henry (56) lab, Susan (54) William (38) Daniel (34) James (32) Ellen (21)
1911MDX-Edmonton, Sch 207, James (30) lab, Sarah Ann (31) Nelly Matilda (5) Florence Alice (9w)
The discrepancies are
1) Susan has replaced Matilda of 1881. The suspicious part is that although Susan is stated to have been married to Henry for 39 years the children given are four born and four alive, none deceased, which omits the other children.
2) James appears with his wife and two daughters as well as under his father's Schedule, in 1911.
3) Noah's dob is given in his death registration as born 3 August 1897 although the baptism at Orpington seems to have said b3/6/1897. His birth registration in S1897 would support either date.
Elijah snr died in 1857 so there was time for him to have had a son called Henry bc1852 and there is one Henry WITNEY registered Dunmow in J1853. Some of Elijah's other children were registered in Essex.
TL