Wow, thank you everyone!
1) I have Sarah Sherricks as the wife of Peter Manning in my notes but remember having a problem with that apart from the age gap. I'll look at that one again. Of course, I don't know if this Peter is my Peter. I don't remember having come across the Peter Manning who died in 1835.
2) Wivenhoe: thanks for the 1851 list, which I did have. Reuben and Ann had two more children after that: Caroline (1852-1854), who died of cholera and was included in John Snow's study; and Harriett (1856-1934) who emigrated to Canada and was my ggmother.
The rest I haven't had a chance to absorb and won't until a little later. I'll get back to you if only to say thank you again.