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Oh yes, I see what you mean.
If the gravestone is in the public domain then surely GDPR regulations wouldn't apply. Those still living must have given their permission for their names to be added to the gravestone. 

Hello Trevellian
Have you checked any of the original parish registers from the OPC details? How do you know Mary was the second daughter of Jesse Sloggett & Jane Taylor?
There is a Mary Strout on the findagrave website, Saint Endellion churchyard, 1749-1835.

Hello Waughhunter
I'm no expert, but from the 1871 census (FreeCEN) i have found:
Danning, John. Head, Married, M, 30, Ag lab, Birthplace: North Petherwin
Danning, Mary. Wife, Married, F, 24,              Birthplace: Lawhitton, Cornwall.
Piece 2225, Enum district 4, folio 81, P15, Schedule 76.

Baptism from the Parish register (FreeREG):
24th Sept 1871  Thomas Danning. Place: Lawhitton  Church: Saint Michael
Father: John. Occupation: Labourer  Mother: Mary  Abode: Luccombe 
Register entry No.664

Baptism from Cornwall OPC:
5th Feb 1902  James Danning.  Parish circuit: Liskeard
Father: Thomas  Occupation: Soldier   Mother: Emelene
Piece 2225, Enum district 4, Folio 81, P15, Schedule 76.

Marriage from Cornwall OPC:
Groom: John Dunning  Bride: Mary Heard  at Launceston Bible Christian Chapel 31st March 1869.

Seems to be a lot of Thomas Danning's from North Petherwin!

I hope this is of some use. 

Hello Pete

What's the name of the book you're trying to get the pages from?