I am trying find the baptism of Sarah Powell born 1818 approx, in Lydbrook. Her brother Thomas Powell born 1816, also in Lydbrook lived with Sarah and husband James Shott in 1871.

This appears to be the marriage of Sarah Powell to James Shott:

Year 1838
Month Nov
Day 4
Grooms_Surname SHOTT
Grooms_Forenames James
Grooms_Age of age
Groom_Condition Bachelor
Grooms_Occupation Labourer
Grooms_Residence Aston Ingham
Grooms_Fathers_Surname Shott
Grooms_Fathers_Forenames Edward
Grooms_Fathers_Occupation Cottager
Brides_Surname POWELL
Brides_Forenames Sarah
Brides_Age 20
Brides_Condition Spinster
Brides_Occupation [ditto] Labourer
Brides_Residence Aston Ingham
Brides_Fathers_Surname Powell
Brides_Fathers_Forenames Thomas
Brides_Fathers_Occupation Labourer
Licence_or_Banns Banns
Date_of_Banns
Signature_or_Mark Both mark
Witness_1 Mark of James Philpotts
Witness_2 Harriet Shott
Other_Witnesses
Officiating_Minister Hy Lawson Whatley
Event Marriage
Memoranda
Notes
Register_Reference AR90/7
Page_Number 3
Parish_Chapel Aston Ingham

This tells us that her father is Thomas. You also tells us that Sarah's brother is Thomas and the following baptisms fit:

Year: 1820
Month: Nov
Day: 19
Parents_Surname: POWELL
Child_Forenames: Sarah
Fathers_Forenames: Thomas
Mothers_Forenames: Ann
Mothers_Surname:
Residence: Morwood
Occupation: Barge Man
Officiating_Minister: H. Berkin
Event: Baptism
Memoranda:
Notes:
Register_Reference: P109 IN 1/1
Page_Number: 24
Parish_Chapel: Drybrook

Year: 1825
Month: Jan
Day: 25
Parents_Surname: POWELL
Child_Forenames: Thomas
Fathers_Forenames: Thomas
Mothers_Forenames: Ann
Mothers_Surname:
Residence: Moorwood Coppice
Occupation: Bargeman
Officiating_Minister: T. D. Fosbroke Min[iste]r
Event: Baptism
Memoranda: son of: [Marginal note bracketed with item 391].Transposed by mistake T. D. F.
Notes:
Register_Reference: P275 IN 1/7
Page_Number: 49
Parish_Chapel: Ruardean

Moorwood is between Lydbrook and Ruardean.

Mike

Following up the Aston Ingham connection, the GR transcription of the 1871 Census has,

Linton, Heref
Daniel TAYLOR, Head, 27, Farm Labourer, born Glos, Oxenhall
Emma TAYLOR, Wife, 20, born Heref, Aston Ingham
William TAYLOR, Son, 1, born Heref, Linton
Sarah SHOTT, Mother-in-law, 52, Tailoress, born Glos, Lydbrook

Emma ties up with the SHOTT household at Aston Ingham in 1861 when she is aged 10 and in 1851 when she is 1 month.

However, this Sarah SHOTT doesn't seem to tie up with the 1871 information in the first post. Is she a different one?

As a matter of morbid interest there is a long report (too long to transcribe) in the Cheltenham Chronicle, 29th August 1865 (and others in the Gloucester Journal), of a James SHOTT and Emma SHOTT (aged 15) of Gorsley (not far from Linton)as witnesses in the inquest of a murder victim at Upleadon (Sarah Maria Davis). The places and ages fit.

Memo to self. This might explain it,

1871 Census, GR transcription,

Aston Ingham

James SHOTT, Head, Married, age unclear (40 with "not known" written after. Could be 60) Woodcutter, born Heref, Aston Ingham.

Thomas POWELL, Lodger, 55, Hurdlemaker, born Glos. Lydbrook

Looks like Sarah was with her daughter on Census night.