Thanks Mike, so Miss Willesford was definitely moving in the best of Lydney's social circles !

This Marriage is included within this Peerage site.
http://www.thepeerage.com/p14431.htm

As might be expected Charlotte Bathurst has been covered within this prior post
www.forum.forest-of-dean.net/index.php?id=3755

The 1891 census for Miss Willesford and Mrs Charlotte Willesford, "niece & sister" of Mr Charles Bathurst at his Lydney Park residence, does indeed suggest a fine home;

Given Name Surname Relationship Gender Age Estimated Birth Year Birth City or District Birth County Birth Country
Charles Bathurst Head Male 54 1837 Barwick in Elmet Yorkshire England
Mary G Bathurst Daughter Female 24 1867 London England
Charles Bathurst Son Male 23 1868 London England
Arthur H Bathurst Son Male 18 1873 London England
Charlotte Willesford Sister Female 60 1831 Barwick in Elmet Yorkshire England
Mary S Willesford Niece Female 20 1871 London England
Viseount Domaraile Visitor Male 24 1867 Scotton Lincolnshire England
Claude Schuster Visitor Male 21 1870 Pendleton Lancashire England
Francis S Cokarpre Visitor Male 19 1872 Putney Surrey England
Margaret A Binglle Visitor Female 26 1865 Edinboro
Frances L Peter Visitor Female 16 1875 Portishead Somerset England
Helen Galbraith Servant Female 38 1853 Edinboro
Annie M Collins Servant Female 28 1863 Easdon Royal Wiltshire England
Agnes Wareham Servant Female 26 1865 Moxtinee Berkshire England
Sarah Hickley Servant Female 26 1865 Cottam in the Elmo Staffordshire England
Etter S Dayne Servant Female 18 1873 Redgrave Suffolk England
Evelyn Glass Servant Female 20 1871 Hanley Staffordshire England
Edith L Liot Servant Female 17 1874 Farnham Royal Buckinghamshire England
Mary N Best Servant Female 16 1875 Bramshaw Hampshire England
Thomas Everall Servant Male 20 1871 Minstreley Shropshire England
Arthur J Black Servant Male 16 1875 Toronto Canada
John Fowler Servant Male 46 1845 Macclesfield Cheshire England

Prior to this,
1871, Ivedon House, Awliscombe, Devon;
Given Name Surname Relationship Age Estimated Birth Year Gender Birth City Birth County Birth Country
F T Bedford Willesford Head 63 1808 Male Tavistock Devon England
Charlotte Willesford Wife 40 1831 Female Barwick in Elmet Yorkshire England
Mary Willesford Daughter 8 Months 1870 Female Terrace Hyde Park Cambridgeshire England
Elizth Patch Servant 34 1837 Female Ottery St Mary Devon England
Ellen Hill Servant 18 1853 Female Tavistock Devon England
Sarah James Servant 15 1856 Female Lydney Gloucestershire England
Eliza Briggs Servant 40 1831 Female Southwark London England

and still there in 1881;
Given Name Surname Relationship to Head Marital Status Age Estimated Birth Year Gender Occupation Birth City Birth County Birth Country
Francis Thos. Bedford Willesford Head Married 73 1808 Male Vicar Of Awliscombe Tavistock
Charlotte Willesford Wife Married 50 1831 Female Barwick Rectory Leeds Yorkshire England
Mary Sophia Willesford Daughter 10 1871 Female Scholar London, London Middlesex England
Enid Hayton Boarder 8 1873 Female Scholar Shildon Durham England
Susan Nicholson 20 1861 Female Governess Birkenhead Chester
Jane Banks Servant 22 1859 Female Cook Sydney Gloucestershire England
Lucy Ann Bush Servant 24 1857 Female Parlour Maid Whimple
Georgina Male Servant 24 1857 Female Housemaid Shepton Beauchamp

Ivesdon House looks another fine old house in beautiful surroundings, http://www.britishlistedbuildings.co.uk/en-87006-ivedon-house-awliscombe-devon
http://www.awliscombeparishcouncil.co.uk/local_information/history.html

Miss Willesford eventually becomes Mrs Parker;

1911, "Hurstleigh", Witton Villas, Falmouth;
Name Relation to Head Birth Date Age Gender Marital Status Years Married Occupation Birth Place Address
John Lesley Parker Head 1874 37 Male Married Clergy Man Abergavenny, Monmouthshire
Mary Sophia Parker Wife 1871 40 Female Married 4 London, England
Charlotte Amelia Parker Daughter 1908 3 Female London, England
Charlotte Willesford Mother-in-law 1831 80 Female Widowed 12 Barwick, Yorkshire
Daisy Ellen Martin Servant 1885 26 Female Single Cook Hastings, Sussex
Sabina Williams Servant 1878 33 Female Single Parlourmaid Silverwell, Cornwall
Clara Boynes Hicks Servant 1893 18 Female Single Nurse Falmouth, Cornwall

From FreeBMD, in another fine address;
Surname First name(s) District Vol Page
Marriages Mar 1907 (>99%)
PARKER John Lesley Kensington 1a 240
Willesford Mary Sophia Kensington 1a 240

Surname First name(s) District Vol Page
Births Jun 1908 (>99%)
Parker Charlotte Amelia Mt. Bosworth 7a 504
(Market Bosworth is in Leicestershire, not "London")

Surname First name(s) Mother District Vol Page
Births Jun 1912 (>99%)
Parker Catharine M Willesford Falmouth 5c 261

I think Mary and her mother both lived the rest of their days in Cornwall;

Surname Given Name Age District Volume Page Transcriber
Deaths Dec 1930
Parker Mary S. 61 Liskeard 5c 59 vickiuk

Surname First name(s) Age District Vol Page
Deaths Dec 1921 (>99%)
Willesford Charlotte 91 Falmouth 5c 178

Surname First name(s) Spouse District Vol Page
Marriages Sep 1930 (>99%)
Parker Charlotte A Spencer Plymouth 5b 673
Spencer Almeric A W Parker Plymouth 5b 673

Googling this unusual name suggests Spencer was an "old soldier", perhaps ?
https://www.thegazette.co.uk/London/issue/27406/page/939/data.pdf
https://www.thegazette.co.uk/London/issue/27645/page/941/data.pdf

Marriages Dec 1940 (>99%)
Parker Catherine M Royle Liskeard 5c 163
Royle Malcolm D B Parker Liskeard 5c 163

I cannot find John Lesley Parker's death, but he is listed in the 1939 Kelly's Directory as Rev'd at Lanteglos Vicarage, Fowey, Cornwall; midway between Falmouth & Liskeard (above).
Also as an arrival at Southampton on 24th Jan 1950, on a ship from Mozambique.