Margaret, I'm also researching PICKESS in Suffolk and it's possible we may have a connection. My great-great-grandfather was William PICKESS, b. around 1853, married to Caroline.
I've been looking at the Nathan Davy PICKESS family in the 1861 census and I think his son William R. (age 7 in 1861) may be my William - both were born in Ipswich and the age is about right. Unfortunately I can't find William elsewhere to confirm. In 1891 William and Caroline were living at 1 Siloam Place, Ipswich with sons William, Edward and Daniel.
Do you have any info on Nathan's family from 1861-1891, or any other information on his children?
Regards,
Howard