Harrington, Inch, Deeks, Settle, Sparrow

My grandfather Walter Harrington born 1877 in Belchamp St Paul was killed in WW1 and is remembered on the plaque in St Andrews Church. His parents were 1839 William Harrington and 1842 Mary Inch both born in Belchamp St Paul. Williams father Henry Harrington was baptised 15-4-1804 in St Andrews, his parents were named as William and Catherine Harrington. This is the earliest record I have found for a Harrington in Belchamp St Paul.
Please can anyone give information as to where they married or where they came from?
Catherine died 26-4-1838 and is buried in St Andrews graveyard. Her death certificate states her age as being 62 and therefore born about 1776. She and William had another child Ann baptised in St Andrews 17-5-1807. I have no positive date of Williams death it coul be anytime after 1807 as this is the last child recorded.

I believe William could be William Harrington born in Pentlow 22-2-1775 he is right age and born in an adjacent village. A lesser posibility is William Harrington of Pentlow who married Ann Finch of Foxearth on 29-1-1780 in Foxearth. An elder man who was living in Pentlow at the time of the banns being read. Had Ann passed away William could have married Catherine.
I have been using the excellent Foxearth transcript of ERO for Pentlow, Congratulations and thanks to those who set it up. Any knowledge of the Harringtons appreciated you would be saving my carbon footprint between Croydon and Chelmsford ERO.

Returning to my grandmother 1842 Mary Inch her mother was 1808 Charlotte Deeks, her mother was 1781 Susannah Settle (outside chance could be 1758 Susan Settle), Her parents were John Settle and Mary Sparrow who married in Pentlow 23-10-1740. I cannot find baptism records for either in Pentlow. Can anyone tell me where the Settles and Sparrows came from?
Congratulations to all at Foxearth for pioneering this website and providing so much useful data and the opportunity to place blogs.
Ray Harrington