So they possibly had just 3 offspring Sarah Anne 1829, Elizabeth 1831 and John 1832, father = cordwainer [Harlock]. Sadly no images to check those bap's. Can't see any more after John
Married in Ely, offspring all b. Soham... Fits for John from 1861, just the name Harlock, changing to Haylock from 1861, though if them, married as Haylock
The 1841 in post #20 fits for that family minus father William and dau., Elizabeth...
Not sure about 1851, mother Sarah is a laundress in 1841 & 1861 and a sausage maker in 1851 with a son John Ginn [possibly wrongly transcribed]
So possible that father, William died or left 1832-1841..
NBI has Soham independent Chapel 1830-1834 and Soham St Andrew 1801-1837 so there are gaps..
CFHS has this burial for Soham in that period

Deceased
HAYLOCK William
- Age 83
- Address otp
Burial Date 16-Dec- 1838
Also this..
Deaths Q4 1838
Harlock William
Newmarket
14 65
[Soham in Newmarket RD]
Geoff
EDIT: GRO has 84y for 1838 death..