Martin P-L writes:

1798-1877

1798 Whitchurch Baptism Register:
  "1798 Jul 16   POWYS   Richard Thomas s. Philip Lybbe, Esqre & Louisa (nee MITCHELL) born April 11 1798"
1816 matriculated at University Coll. 1820  B.A.
1823  M.A.  Chaplain of Goring Heath; Vicar of Hullavington.
1829 married Caroline Scott-Waring, at Caversham.  They had 6 children, but only a daughter married, Ellen Anna Philippa (1838-  ) [TFPL, 2011: The 1911 census shows her to have been single so she never married].  Presumably she is the E.A.P. Powys, great great grand-daughter of Sir Thomas, who (before marrying) copied out the family memorandum books.  She undertook this initially for William Reginald but, since he died before she had completed it, she gave it to Reginald Cecil instead.
Their son Philip Edward, born 1841, joined the 57th Regiment in 1860.  In 1863 he was wounded in New Zealand, and in 1867 he died of wounds.
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In 1841 census he had the occupation of clergyman and his household was himself, his wife Caroline, 5 children, 3 Wells children, a governess, two male servants and 5 female servants.

In 1851 census the the eldest daughter had died so there were four children, Richard was chaplain of Endowed Almshouses (Goring Heath?) and they had with them two Scott Warings.  The resident house servants were only three and finally they had with them a schoolmistress to Goring Heath (Almshouses?).
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In 1871 census he was vicar of Hullavington, Cricklade, Wilts.  The household, "Street Private House (Vicarage)", was:

Richard Thomas Powys, Head, mar, male, 72, born Oxon, Whitchurch
Caroline Powys, Wife, mar, female, 66, born India, ***sh (British Subj)
Ellen Ann Philippa Powys, daur, unm, female, 35, born Oxon, Goring Heath
Selinea Jemima Powys, daur, unm, female, 33, born Oxon, Goring Heath
Anne Elizabeth Seagon (?), serv, unm. female, 33 (?),Cook-domestic, born Wilts, Hullavington
Elin (?) Mary Chamberlayne, serv, unm. female, 27, Housemaid domestic, born Oxford.
Henry Senen (?), serv, unm., male, 18, Groom domestic, born Essex, Colchester.
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All their children d. unm. and sp.
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In her diaries on 11 April 1802, Caroline Powys, née Girle, wrote: our Grandson Richd Thomas Powys Birth day 4 years old Born 1798.
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From the Society of Genealogist’s record of Monumental Inscriptions:

Cannes - MIs of British subjects buried in Le Grand Jas cemetery

Transcribed by Paul Leppard
Comment Monumental inscriptions of British subjects buried in Le Grand Jas cemetery, Cannes. Transcribed by Paul Leppard. Photographs of many of the gravestones are available from the Cannes Tourist Information website at http://www.cannestouristinformation.co.uk/cemeterysearching.aspx

Entry from Cannes
Photo      86    
Alley      4    
Surname   Powys    
First names Richard Thomas    
Day died   27    
Month died  Jan    
Year died   1877    
Age      78    
Title and letters   Vicar of Hullavington, Wilts
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This reference from The National Archives may, or may not, be interesting:

Edington-Knoyle

MANUSCRIPTS IN THE SOCIETY OF ANTIQUARIES OF LONDON. JACKSON COLLECTION. Rev. Powys, vicar of Hullavington, from Sathanus Roy, King of Hell, 1867, fol. 74; sale particulars of Iford House and lands, 1777, fol. 79; Kingston Deverill: 16th-century extract relating to a pre

Held by: Society of Antiquaries of London
Date: 1549 - 1867
Reference: SAL/MS/817/7
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His probate index:

1877
POWYS The Reverend Richard Thomas
316
Effects under £1,500.

  7 April   The Will of the Reverend Richard Thomas Powys late of Hullavington in the County of Wilts Clerk Vicar of Hullavington who died 27 January 1877 at Cannes in France was proved at the Principal Registry by Ellen Anna Philippa Powys of Hullavington Spinster the Daughter one of the Executrixes.

I leave ordering this will until I get back to this branch, perhaps in a year’s time?  ie 2023?
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[ Note: I still have some notebooks of Powys genealogy by Ellen. ]