There seems to be a fair amount of information available on Google and Google books.
There are these MI's from St Mary Lewisham
http://www.kentarchaeology.org.uk/Research/Libr/MIs/MIsLewisham/01.htm"78. A large alter tomb of granite: On north side 3 compartments Left In loving memory of Frederick Charles son of Peter Hubert DESVIGNES born September 10th 1844 died May 1 1876 Centre In loving memory of Peter Hubert Desvignes born April 29th 1804 died December 27th 1883 Right Also of
Mary Frances wife of Peter Hubert Desvignes died November 28 1850 aged 38 years. On west end: In memory of George Lewis died April 1 1843 | aged 3 years. | Also of George Christopher died January 26th 1844 aged 7 months children of Peter Hubert Desvignes"
"
266. Altar tomb To the memory of | Sophia Ann DESVIGNES | daughter of Elize Hubert and Desphinous Desvignes of this Parish who departed this life | November 28th 1816 | aged 5 years and 7 months. Augustine Desphinous Desvignes mother of the above who died August the 19th 1825 in her 36th year a native of Constantinople. John Theophilus Desvignes who departed this life on the 13th of November 1837 aged 13. Elize Hubert Desvignes husband of the late Augustine Desphinous and father of the above children obt the 25th of March 1844 aged 70. George Lewis Desvignes born 16th April 1810 died at Vienna 1st April 1843. George Christopher Desvignes born 26th June 1813 died at Vienna 26th January 1844
(?)(LAS manuscript says 1844) Sons of Peter Hubert and Mary Frances Desvignes and grandsons of the above E.H. and A.D. Desvignes"
See also reports of the Naturalisation Bill of 1831
http://www.british-history.ac.uk/report.aspx?compid=17008#s6