No birth index found.

Her baptism:

“                         Page 6
“BAPTISMS solemnized in the Parish of St Paul’s Knightsbridge
“  in the County of Middlesex in the Year 1853
“. . . .
“When Baptised:       1853 Aug 9th
“No:                  46
“Child’s forename:    Beatrice Evelyn
“Parents’ Forenames:  William Bruce & Caroline Harriet
“Parents’ surname:    Stopford
“Abode:               58 Eaton Place
“Profession:          Gentleman
“Celebrant:           Charles E Parry
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Not found in 1881 census.

In 1891 they were at Chester Street, St George Hanover Square, London and their daughter is revealed to have been born in Portugal, possibly while he was on an embassy posting:

First name(s)  Last name  Relationship  Marital status  Sex  Age  Birth year  Occupation  Birth place
Harry S C Clarke  Jervoise  Head  M  M  59  1832  Senior clerk foreign office  Chichester, Sussex
Beatrice          Jervoise  Wife  M  F  37  1854  -                            Middlesex
Kathleen          Jervoise  Daur  S  F  15  1876  -                            Portugal
Julia             Prieser   Serv  S  F  48  1843  Governess                    Germany
Ellen             Jones     Serv  S  F  41  1850  Cook                         Dymock, Glos
Anna              Abbu?     Serv  S  F  35  1856  Ladysmaid                    Switzerland
Alice             Hiscock   Serv  M  F  36  1855  Housemaid                    Freckenham, Suffolk
Flora             Mills     Serv  S  F  16  1875  Kitchen maid                 Cirencester, Glos
William           Cook      Serv  S  M  27  1864  Butler                       Gosport, Hants

Ref:
Archive reference  RG12
Piece number       71
Folio              71
Page               24
Combined:          1891 ref: RG12, piece 71, folio 71, p. 24
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BP reports “Beatrice Evelyn; m 3 Aug 1874 Sir Harry Samuel Cumming Clarke Jervoise, 5th Bt, and d 4 July 1943, leaving issue (see 1933 edn)”
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In 1911 she and her husband had their daughter Kathleen and her husband staying with them in a large household.  See their daughter’s Notes for details.  Her surname was entered there as Jervoise.
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Not found in 1939 Register.  So I widened her range of birth years and found this person at The Manor, Ewelme, Oxfordshire:

First name(s)   Last name(s)  Birth date  Sex  Occupation  Marital status  Schedule  Schedule sub number
Beatrice G De? Jervis  28 Nov 1859  Female  Private Means  Single  27  1  

Though I also found a Beatrice Jervis living at the Manor, Ewelme in 1911 who was not her, as Beatrice Evelyn was in Idsworth House, Horndean, Blendworth, Hampshire.
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Death not found on FindMyPast,
One death on FreeBMD for Beatrice Jervoise from 1920 to 1950, of a Beatrice A L Jervoise in 1944 in Basingstoke.

Grave found on Find-a-Grave with a search for ‘Clarke-Jervoise’ and shows a picture of her memorial stone (on her husband’s much earlier stone) and gave her death date as ‘7 JULY 1943’.

This memorial led to finding her entry on the Probate Index, see her Will Notes.

Her death was at Fillongley Hall which was the home of the Adderley, barons Norton, family into which her sister Grace had married.  And she is indeed to be found in their 1939 Register listing as:

  FIRST NAME(S)  LAST NAME(S)  DOB  SEX  OCCUPATION  MARITAL STATUS  SCHEDULE  SCHEDULE SUB NUMBER
  Henry A                  Adderly [sic]  26 Sep 1854  M  D L - J P      M  131  1
  Grace                    Adderly [sic]  02 Sep 1854  F  Wife           M  131  2
  Jervoise Beatrice E (B)  Clarke         03 Jul 1853  F  Private Means  W  131  3

See her sister’s Notes for further details.  But it does give a birth date for her.
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Finally I found her death on the online GRO index, with only the tiniest of spelling errors and only using the second half of her double barrel surname:

Name:                                Age at Death (in years):  
JERVOICE, BEATRICE EVELYN CLARKE     90  
GRO Reference: 1943  S Quarter in MERIDEN  Volume 06D  Page 514

This mis-spelling was replicated in the index provided by FindMyPast and is indeed on the old printed index.
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Her probate index:

JERVOISE dame Beatrice Evelyn Clarke of Fillongley Hall Coventry widow died 4 July 1943  Probate Llandudno 28 November to Hubert Clementi Smith D.S.O. retired brigadier H.M.army.  Effects £8782 17s. 11d.

Order her will?
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Hubert was her son-in-law.
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Her memorial stone at Blendworth, East Hampshire District, Hampshire, below her husband’s, reads:

    AND OF HIS WIFE
    BEATRICE EVELYN
   DIED 4 JULY 1943
       AGED 80

Hoever the day of the death is unclear. At first it looks like the vertical stroke of a ‘7’.  But the probate death date is 4th July.  And this sloping stroke could also be the slanting bit of a ‘4’ with the rest fractured off (the engraving is all done in relief).  So I have now changed this to a ‘4’.
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Their marriage transcript, by me, from the image kindly provided by Ancestry of the Register page:

“                            Page 17
“1874. Marriage solemnized at The Parish Church in the District parish of St Peters Pimlico
“   in the County of Middlesex
“No:            34
“When married:  August 3 1874

                   His                                    Hers
                   ===                                    ====
“Name:          Henry Samuel Cumming Clarke-Jervoise  Beatrice Evelyn Stopford-Sackville
“Age:           full                                  full
“Condition:     Bachelor                              Spinster
Profession:     Esquire                               -
Residence:      Chester Terrace                       Grosvenor Gardens
“Father:        Samuel Clark-Jervoise                 William Bruce Stopford-Sackville
“Father’s job:  Esquire                               Esquire

“Married in the Parish Church according to the Rites and Ceremonies of the Established Church,
“   by Licence by me,  George H. Wilkinson
“This Marriage was solemnized between us,  Harry J. C. Clarke-Jervoise, Beatrice Evelyn Stopford-Sackville
“  in the Presence os us,  S.G.Stopford Sackville, Samuel Clarke-Jervoise, C H Stopford Sackville
“                          E M Sartory,  Emily Anne Clarke-Jervoise
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