Paul Willoughby writes, 15 Nov 2009:

“The younger William Wheatley (cousin of Caroline Girle)  
had a son (his youngest child) by the name Leonard Lewin Wheatley who,  
with a Mary Dawson, fathered an illigitimate child, Sarah Susannah.  
Sarah Susannah assumed the last name of her mother and thus became  
Sarah Susannah Dawson.  Sarah Susannah married John Whyman and had a  
number of children including Leonard Frederick Whyman whose daughter,  
Doris Gwendolen Whyman married John Jeston Willoughby.  Doris and John  
had a single child, John Whyman Willoughby who is my father.  My  
family connection to Leonard Lewin Wheatley is documented in a family  
tree hand drawn by my grandmother, Doris.  We also inherited the  
Wheatley crest in the form of a signet ring which my father wears, and  
which he subsequently had made for his three sons.”

From FreeBMD, here is almost certainly the births of some of these, though the first one is doubtful:

Surname First name(s) District Vol Page
Births Jun 1839
Dawson Sarah Susanna Marylebone 1 186

Surname First name(s) District Vol Page
Births Dec 1868
WHYMAN Leonard Frederick Epsom 2a 4

Surname First name(s) District Vol Page
Births Jun 1897
Whyman Doris Gwendolen Brighton 2b 254

Surname First name(s) Mother District Vol Page
Births Jun 1924
Willoughby John W Whyman St. Giles 1b 840

Then some marriages (with the spare couples deleted):

Surname First name(s) District Vol Page
Marriages Jun 1862
Dawson Sarah Susannah Bath 5c 1118   
Whyman John Bath 5c 1118

Surname First name(s) District Vol Page
Marriages Sep 1893
Kemp Lydia Alexandra Brighton 2b 486   
Whyman Leonard Frederick Brighton 2b 486

Surname First name(s) Spouse District Vol Page
Marriages Jun 1921
Whyman Doris G Willoughby Brighton 2b 434   
Willoughby John J Whyman Brighton 2b 434
_________________________________

Now for a few censuses:

(a) 1901:

Name Relation Condition Sex Age Birth Year Occupation   Disability  Where Born

WHYMAN, Leonard F Head Married M 32 1869 Living On Own Means   Sutton, Surrey
WHYMAN, Lydia A Wife Married F 35 1866   Hove, Sussex
WHYMAN, Doris G Daughter F 4 1897   Brighton, Sussex
HONKIL, Fanny Servant F 34 1867 Cook (Domestic)  Kensington, London

RG number: RG13 Piece: 937 Folio: 10 Page: 12    

Registration District: Steyning Sub District: Shoreham EnumerationDistrict: 15
Ecclesiastical Parish: All Saints

Civil Parish: Hove Municipal Borough:
Address: Brooklyn, Pembroke Avenue, Hove
County: Sussex
_________________________

(b) 1871 but no Leonard, nor could he be found on his own.  There is a chance that he was entered as Louis:

Name Relation Condition Sex Age Birth Year Occupation  Where Born

WHYMAN, John Head M 37 1834 Surrey
WHYMAN, Sarah S Wife F 32 1839 Middlesex
WHYMAN, Samuel Son M 7 1864 Kent
WHYMAN, Fanny E Daughter F 6 1865 Kent
WHYMAN, Louis Son M 2 1869 Surrey
WHYMAN, Edward Son M 0 1871 Surrey
PAYNE, Harriet Servant F 24 1847 Essex
BOYCE, Elizabeth Servant F 22 1849 Surrey

RG number: RG10 Piece: 797    Folio: 73 Page: 18    

Registration District: Epsom Sub District: Carshalton EnumerationDistrict: 11
Ecclesiastical Parish:

Civil Parish: Sutton Municipal Borough:
Address: The Green, Sutton
County: Surrey
_________________________

(c) John Whyman was not to be found as a potential landowner (in 1871) in the 1861 or 1851 censuses.

Received from Paul Willoughby.

WILL OF WILLIAM WHEATLEY
THIS IS THE LAST WILL and testament of me William Wheatley of Lesney House in the County of Kent.  Esquire which xxxx this eleventh day of June in the year of our Lord one thousand eight hundred and seven as follows that is to say I desire to be buried in the Church (?) of Erith in the said County where my ancestors lie and that my body be embowelled (?) and xxxxxx xxxx xxxx I direct that all my just debts and funeral expenses shall be paid and satisfied out of my personal estate as soon as may be after my decease I give and devise my freehold messuages situate and standing in Fenchurch Street in the city of London with the appointments (?) unto my son George Wheatley his heirs and assigns forever I give and devise all my lands tenements and benefits whatsoever situate lying and being within the Isle of Thanet in the said County of Kent with their and every of their  xxxxxx  unto my son Leonard Lewen (George crossed out) Wheatley his heirs and assigns forever I give and bequeath unto my dear wife Margaret Wheatley the sum of one thousand pounds sterling to be paid within three months after my decease and to each of my daughters Lucy Margaret Wheatley and Maria Margaret Wheatley and to each of my sons George Wheatley and Leonard Lewen Wheatley the like (life?) sum of one thousand pounds sterling which xxxxx of one thousand pounds a piece to my said daughters Lucy Margaret and Maria Margaret and my said sons George and Leonard Lewen I direct shall be paid to them respectively at the end of three calendar months next after the decease of my said wife but if the said Maria Margaret shall not at that time have attained the age of twenty one years or be married I direct the said legacy to her of one thousand pounds to be paid to her on her attaining that age or upon her marriage which shall first happen and if the said Leonard Lewen shall not at the said time of payment have attained the age of twenty one years I direct the said legacy to him of one thousand pounds to be paid him on his attaining that age and in case the said Maria Margaret should xxxx age of twenty one years unmarried or the said  Leonard Lewen should die under that age I direct the said legacy of him or her so dying the xxxx to fall into the xxxx of my personal estate I will and direct that my Executors hereinafter  named shall and so as soon as conveniently may be after my death appropriate and set apart so much of my personal estate as will produce xxxxx annual xxxx or sum of xxx hundred pounds sterling and to xxxxx our and invest the same in xxxx out of the public stocks or funds or in or upon xxxxx or xxx xxxx in their names and that they and the survivors  and survivor of them and the Executors or administrators of such survivor shall and so xxxxx xxxx of upon the (turn to pdf page 4) trust of for the intents and purposes hereinafter xxxxx and xxxx xxxx of and xxxx xxxx that is to say upon trust to pay unto or permit said suffer or fully authorize and empower my said dear wife and her assigns to receive and take the interest dividends or annual proceeds thereof during her life to and for her and their not said benefit and after her decease upon trust to transfer or assign so much of the capital of the said stock funds or securities so appropriated as will produce the sum of ten thousand pounds sterling equally between my said two daughters and to and for their own absolute use and benefit respectively the xxxxxx or share of my said daughter Lucy Margaret to be paid to her as soon as conveniently may be after the decease of her said mother and the xxxx or share of my said daughter Maria Margaret to be paid to her at the same time if he should have then attained the age of twenty one years or be married but if she should be then under that age to be paid to her on her attaining the said age of twenty one years or on her marriage which shall first happen after the death of my said wife but in case my said daughter Maria Margaret shall die under that age unmarried then I direct her xxxxx or share of the said sum of ten thousand pounds to fall into the residue of my personal Estate and upon further trust (?) to transfer or assign the residue or remainder of the capital of the said xxxxx funds or securities so appropriated as afore said unto such person or persons and in such xxxxx shares or proportioned and in such xxxxxxx and form as my said dear wife by her last will and testament in writing or any xxxxxxx thereto or testamony (?)  writing to xxx are signed and published in the presence of and to be attested by two or more credible witnesses shall give or bequeath the same and in xxxx of such gift or bequest and as to so much of the said residue of the said stocks, funds or securities of which there shall be no such gift or bequeath made as aforesaid upon trust to transfer or assign the same unto and among or between all and every such or so many of my children by my said dear wife as shall be living at the time of her death share and share alike and as to all the xxxxxxx residue of my personal estate goods xxxxxx and efforts whether consisting of ready money xxxxxx in the public funds or government securities or other securities for money jewels plate household goods and furniture books pictures xxxx china farming (?) horse and implements of husbandry or whatsoever such residue may xxxxxx of after payment of all my just debts funeral expenses the expenses of proving (?) this my will and (CHANGE TO PAGE 5) the legacies hereby bequeathed I so give and bequeath the same (?) residue and every part thereof respectively unto my said dear wife for her own absolute use and benefit and I so appoint my said dear wife Margaret Wheatley Executrix and my said sons William Wheatley John Wheatley Henry Wheatley and George Wheatley Executors of this my will and I appoint my said dear wife and my said sons William Wheatley John Wheatley and George Wheatley guardians of my said sons Leonard Lewen Wheatley and my said daughter Maria Margaret Wheatley during their respective minorities (?) and I do hereby devise and declare that my said trustees and Executors shall not be answerable or accountable for xxxxxxx or other (?) of them or for the acts deeds receipts neglects or defaults of the others or other of them but xxxxxx of them for her and his own acts deeds receipts neglects and defaults only nor for any more of the said trust monies or efforts than shall actually come to their xxxxxx respectively nor for any xxxx thereof which may happen or otherwise in the execution of the said trusts unless by or through their own wilfull default respectively and that they xxxx and every of them shall and may out of the monies which shall come to their her or his hands or hand by virtue of the trusts aforesaid return to all such costs charges damages and expenses as they any or either of them shall or may bear sustain or pay or be at or put unto for or by reason of the trusts hereby in them xxxxxxx or in or about the management or Execution thereof and lastly hereby xxxxxx all xxxxx and other wills by me at any time heretofore made I do declare this to be my last will and testament in writing whereofs the said William Wheatley have hitherto set my hand and seal and of this my will I have executed or intend to execute or xxxxxx in life xxxxx the day and year first above written William Wheatley (icon) – the writing contained in this sheet of paper was signed dated published and xxxxx by William Wheatley Esquire the xxxxxx as and for his last will and testament in the presence of us who at his request in his presence and in the presence of each of them have xxxxxx our names as witnesses ---- Alex Murray of Symonds time – In Brooke --- Mr Morgan ---- clerks to sir Murray -----

I William Wheatley of Lesney in the county of Kent make this codicil to my last will (CHANGE TO SECOND PDF) bearing date this eleventh day of June one thousand eight hundred and seven and which I have just executed and direct it to be taken as part of my said will that is to say I give and bequeath unto my son George Wheatley over and above the legacy and provision I have given and made for him the further sum of five thousand pounds sterling and direct the same to be paid to him out of my personal estate as soon as conveniently may be after the death of my dear wife and I give and bequeath unto my son Leonard Lewen Wheatley in like manner a further sum of five thousand pounds sterling and direct the same to be paid to him as soon as conveniently may be after the death of my dear wife --- William Wheatley --- Signed and published and declared by William Wheatley Esq as a codicil  to his last will Alex Murray – J. Brooke his clerk

This will was proved at London with a codicil on the eleventh day of July in the year of our Lord one thousand eight hundred and seven before the Right Honorable Sir William Wyxxxx Knight Doctor of Law Master Keeper of Commissary of the perogative Court of Canterbury lawfully xxxxxx by the oathes of Margaret Wheatley widow the Relict of the deceased and William Wheatley John Wheatley Henry Wheatley and George Wheatley Esquires the sones of the said deceased the Executors named in the said will to whom administration was granted of all and singular the goods xxxxx and credits of the said deceased they having been first drawn to wit the said Margaret Wheatley John Wheatley and George Wheatley before the worshipful xxxxx xxxxx xxxxx respectively Doctors of Law and surrogates of the aforesaid commissary duly to administer

From Erith churchyard:

77. Stone pinnacled monument at east end. "To the memory of William WHEATLEY, Esq., Lord of this Mannor. Died June 20, 1807, 64 years of age". Beneath the heraldic arms in front of the monument is, "I trust in my God".