Thanks Debbie! I have seen that marriage listed in BDM but it is the only mention of John Read Nash I know of apart from on son Henry's birth cert. I don't have the wedding cert - guess it can be ordered? Anything you can find on John Read Nash would be great. I have found some READ families in the area which may be connected.
Sarah thought to have married three times - also to Richard Iles and Charles Young [1865 Little Coxwell] but two possible matches in 1881 census as below.

Sarah's father should be Humphrey Moore - does it say Smith? Or is that his occupation.
Would also like some proof that of the parents of Mary Bowles m Humphrey Moore [being John and Mary - as that has been queried].
Ta!
David
1841
Mary Mond [MOORE]
Age:
40
born:
Berkshire
Parish:
Shrivenham
John Holictay
87
Charles Mond
17
Humphrey Mond
40
Humphrey Mond
9
Martha Mond
6
Mary Mond
40
1851
Mary Moore' Age:54
Relation: Wife
Spouse's name: Humphrey
born: Fernham
parish: Longcot
Charles Mare [MOORE]
20
Humphrey Mare
52
Humphrey Mare
18 apprentice blacksmith
Mary Mare
54
1861 Faringdon
Humphrey MOORE
Age:
64
born:
Longcot
Civil parish:
Longcot
Charles Moore
31
Humphrey Moore
28
Mary Moore
64
Mary Ann Moore daughter in law [Humphrey jnr's wife] b Burton on the Water, Gloucestershire
20
1881
Elizabeth Read
Age: 58
Relation: Wife
Spouse's Name: John
born: Longcott
Parish: Longcott
address:
The Lane
Married
Field WorkER
James Jeffries
9
Elizabeth Read
58
John Read carpenter b Bishopstone, Wilts
73
John Read
13
Mary Read
17
1891
John Read
Age:
63
Spouse's Name:
Elizabeth
born:
Bishopstone, Wiltshire
Parish:
Longcot
Neighbors: Joseph Jordan 29, b Longcot and wife Mary [rels - ****]
Franci Jefferier, grandson
10 b Longcot, Berkshire
James Jefferies, grandson
19 b Longcot, Berkshire
Elizabeth Read
60 b Longcot, Berkshire
John Read retired carpenter
63
John Read, son, ag lab
23 b Longcot, Berkshire, ,
1841 England Census
about Elizabeth Read
Age:
45
born:
Wiltshire
Civil Parish: Fovant
Elizabeth Read
45
James Read
16
John Read
55
John Read
13
Stephen Read
8
1851
John Read
Age:
23
Relation:
Servant
born:
Trowbridge, Wiltshire
Civil Parish:
St Pancras,
Middlesex
1871
John Read
Age:
42
Relation:
Head
Spouse's Name:
Elizabeth [nee Jefferies? Father Isaac?? - 41 census]
Where born:
Bishopstone, Wiltshire
Civil Parish:
Longcot
Roseanna Jefferis
wife’s daughter,
b Faringdon, Berkshire
13
Elizabeth Read
b Longcot, Berkshire
44
John Read
42
John Read
b Longcot, Berkshire
3
Mary Read
b Longcot, Berkshire
7
1851 England Census
Name: Sarah Nash
Age: 27
Relation: Pauper
born: Longcote
Civil parish: Stratton St Margaret
1861
Sarah Iles
Age:
37
Relation:
Wife
Spouse's name:
Richard
born: Stratton
Civil parish:
Stratton St Margaret
Emma Iles 1
Richard Iles 36
Sarah Iles 37
1871 census
Stratton St Margaret
Richard Iles 46
Sarah Iles [wife] 47 both Ag Labs b Stratton
Emma Iles 11
1881
With Richard Iles [as Sarah Iles] in Highworth St, Highworth and daughter Emma 21 b Stratton
Emma Iles 21
Richard Iles 56
Birth: abt 1825 - Stratton St Margaret, Wiltshire
Sarah Iles 58
1881 England Census
about Sarah Young
Age:
61
Relation:
Head
Where born:
Longcot
Civil parish:
Little Coxwell
(Widower)
Ag Lab
Humphry Moore 50
Sarah Young 61
1841 census Stratton - a Richard Iles, 18 and Henry Iles, 15, both b Stratton, live with Wm and Elizabeth Seymour.
1851 census
78 Upper Stratton is 26yo, head of house [ag] with mother 'E' Iles, 67 b Minall, [pauper late ag lab] WILTS and sister "A" Iles, 23 b Stratton [servant out of place]
Charles Young is neighbour [#80] age 45 b Lambourn, Berks with wife "A" Young 45 b Purton both Ag lab
1861 census
Age: 36
Estimated birth year: abt 1825
Relation: Head
Spouse's name: Sarah
Where born: Stratton
parish: Stratton St Margaret
Emma Iles 1
Richard Iles 36
Sarah Iles 37
1891
Richard Iles
66
Relation: Head
born: Stratton St Margaret
Civil parish:
Stratton St Margaret
Richard Iles
Age: 66
Relation: Head
Where born: Stratton St Margaret
Civil parish: Stratton St Margaret
Emma Iles [daughter] b Str St Marg 30
Richard Iles 66