Re. William Hitch, son of Sarah...
I think William Hitch's parents are Sarah Hitch (nee Steed) and Eli Lewin, with Sarah and Eli marrying in 1834, and Thomas Hitch probably having died earlier in the same year. If the Thomas Hitch who died in 1834 was Sarah's husband then there would have been a large age gap, about 30 years.
In later years William Hitch uses the name Lewin but also used the name 'Lewin Hitch', which he was married under. His children were registered under the name Hitch or Lewin Hitch. I couldn't find William's marriage in parish registers but it looks like he may be non-conformist. It would be interesting to see the marriage certificate to see who he names as his father.
Timeline summary:
1761 Birth of Thomas Hitch
1793 Birth of Sarah Steed, Latchingdon, dau. of Thomas and Sarah
1793 Birth of Eli Lewin, Purleigh, son of Elisha & Hannah
1808 Marriage of Thomas Hitch & Sarah Steed, Purleigh
1813 Birth of Samuel Hitch, son of Thomas & Sarah, Purleigh
1814 Marriage of Eli Lewin & Hannah Gentry, Latchingdon
1828 Death of Hannah Lewin, wife of Eli, Purleigh
1833 Birth of William Hitch/Lewin, son of Sarah Hitch & Eli Lewin, Purleigh
1834 Death of Thomas Hitch, husband of Sarah, Purleigh
1834 Marriage of Eli Lewin & Sarah Hitch, Purleigh
1841 Census Eli, Sarah & Elijah Lewin and Samuel Hitch, Maldon, labourer
1848 Marriage of Samuel Hitch & Elizabeth Clarke, Maldon
1851 Census Eli & Sarah Lewin, Maldon, labourer
1851 Census William Hitch/Lewin, Maldon, baker
1851 Census Samuel & Emma Hitch, Maldon, groom
1852 Death of Elizabeth Hitch, wife of Samuel, Maldon
1854 Marriage of William Lewin Hitch & Emma French (Maldon?)
1859 Death of Samuel Hitch, Maldon
1861 Census Eli & Sarah Lewin, Maldon, pauper?
1861 Census William Hitch/Lewin, Maldon, baker and preacher
1863 Death of Eli Lewin, Maldon
1871 Census Sarah Lewin, Maldon
1871 Census William Hitch/Lewin, Maldon, baker
1878 Death of Sarah Lewin, Maldon
1881 Census William Hitch/Lewin, Maldon, baker
1885 Death of William Hitch/Lewin, Maldon
1890 Death of Emma Lewin, wife of William, Maldon
GRO BMD references:1863 Q1 Death - Eli Lewin; age 69 (born c1794); Maldon; 04a; 144
1878 Q1 Death - Sarah Lewin; age 85 (born c1793); Maldon; 04a; 180
1848 Q4 Marriage - Samuel Hitch & Elizabeth Clarke; Maldon; 12; 321
1849 Q2 Birth - William Hitch (mmn: Clarke); Maldon; 12; 163
1849 Q3 Death - William Hitch; age 0 (born c1849); Maldon; 12; 101
1850 Q3 Birth - Henry Hitch (mmn: Clarke); Maldon; 12; 162
1850 Q4 Death - Henry Hitch; age 0 (born c1850); Maldon; 12; 103
1852 Q2 Death - Elizabeth Hitch; age 29( born c1823); Maldon; 04a; 100
1859 Q2 Death - Samuel Hitch; age 48( born c1811); Maldon; 04a; 119
1854 Q4 Marriage - William Lewin Hitch & Emma French; Maldon; 04a; 335
1857 Q4 Birth - Samuel Hitch (mmn: French); Maldon; 04a; 184
1859 Q2 Birth - Moses Lewin Hitch (mmn: French); Maldon; 04a; 207
1864 Q1 Birth - Emma Lewin Hitch (mmn: French); Maldon; 04a; 237
1885 Q3 Death - William Lewin; age 52 (born c1833); Maldon; 04a; 217
1890 Q3 Death - Emma Lewin; age 67 (born c1823); Maldon; 04a; 248
Marriages:married: 30 Nov 1808; All Saints, Purleigh, Essex; lic
groom: Thomas Hitch; sin; otp
bride: Sarah Steed? (x); spin; otp; minor __ with consent of Thomas Steed? her father
witnesses: E Hanks?, Wm. ___onklen?
married: 03 Oct 1814; Christ Church, Latchingdon; banns
groom: Eli Lewin; sin; of Ganewdon?
bride: Hannah Gentry; sin; otp
witnesses: W Lewin, Fanny Lewin
https://www.familysearch.org/ark:/61903/1:1:NN7Y-TJXmarried: 10 Nov 1834; All Saints, Purleigh, Essex; banns
groom: Eli Lewin; wid; otp
bride: Sarah Hitch (x); wid; otp
witnesses: Thomas Lamb, Mary Mynott (x)
married: 26 Oct 1848; All Saints and St Peter, Maldon; banns
groom: Samuel Hitch; fa; bach; servant; St Peter's
bride: Elizabeth Clarke (x); fa; spin; -; St Peter's
grooms father: Thomas Hitch, labourer
brides father: Francis Clarke, bailiff
witnesses: William Clarke (x), Elizabeth Marianne Jones
Baptisms:Baptisms - Christ Church, Latchingdon
07 Apr 1793 - Sarah Steed; Thomas & Sarah, his wife; born 19 Jan [recorded under 1793 records but bap. date appears to be written as 1792]
Baptisms - All Saints, Purleigh:
22 Feb 1793 - Eli Lewin; Elisha & Hannah
12 Feb 1809 - Thomas Hitch; Thomas & Sarah
17 Mar 1811 - Thomas Hitch; Thomas & Sarah
17 Mar 1811 - John Hitch; Thomas & Sarah
11 Jul 1813 - Samuel Hitch; Thomas & Sarah; Purleigh; labourer
14 May 1815 - Sarah Hitch; Thomas & Sarah; Purleigh; labourer
17 Aug 1817 - Mary Hitch; Thomas & Sarah; Purleigh; labourer
02 Nov 1817 - Elisha Lewin; Eli & Hannah; Purleigh; labourer
25 Jun 1820 - Hannah Lewin; Eli & Hannah; Purleigh; labourer; born 30 May 1820
13 Oct 1822 - Henry Lewin; Eli & Hannah; Purleigh; labourer; born 18 Sep 1822
28 Aug 1825 - Elijah Lewin; Eli & Hannah; Purleigh; labourer; born 22 Jun 1825
21 Apr 1833 - William Hitch; Sarah; Purleigh; wife of Thomas Hitch; illegitimate