I am trying to research my mothers family tree and hit a dead end trying to confirm the father of William Henry Knight/Pyke
I believe I have found the baptism record for Henry William - baptised June 25 1865 at St Mark's, Kennington (Lambeth).
His mother is listed as Louisa and it has a father's name and occupation of Henry, Printer.
Louisa went on to marry Richard Pyke in 1870 and Louisa and Richard appear together in the 1871 Census with Henry William Knight also at the address, recorded as son.
Have you checked the address on the baptism record to see if any persons named Henry ? are living in or around that area with occupation Printer?
My original thought was Henry 'Knight', married

I did find a
Henry Knight on the 1861/71/81 censuses
born 1831 Reading Berkshire who is married and his occupation
Printer & Compositor but then remembered that when Louisa married Richard Pyke she married as
Louisa Knight and her father
Joel KNIGHT 