Too late for me to investigate thoroughly tonight, but...
A possible marriage, 16 October 1816, St Mary Newington
Robert Lumley, Bachelor, of St Martin in the Fields
+
Jessy Chapman, widow
By licence
https://www.freereg.org.uk/search_records/630d190df493fdd394cd3404Doubtless find it on ancestry
A baptism of a Robert Wheatley Lumley in Woolwich, 2 July 1820
Parents Robert and Jessey
Abode Westminster
Father a Gentleman
https://www.freereg.org.uk/search_records/683c488b8655740fb9f4612bA death
LUMLEY, ROBERT WHEATLEY
Age at Death (in years): 26
GRO Reference: 1846 S Quarter in THE GREENWICH UNION Volume 05 Page 218
PCC will
Will of Robert Wheatley Lumley, Coal Merchant of Great Scotland Yard, Middlesex
10 June 1847
PROB 11/2057/389
https://discovery.nationalarchives.gov.uk/details/r/D107352There is also a PCC will for a Robert Lumley in 1837
Will of Robert Lumley, Coal Merchant of Westminster, Middlesex
3 February 1837
PROB 11/1873/3
https://discovery.nationalarchives.gov.uk/details/r/D304638Quick look, wife is Harriet Lumley
Son Robert Wheatley Lumley
A second marriage for Robert then, 29 November 1823, Plumstead
Robert Lumley of St Martin in the Fields, widower
+
Harriet Ellis, spinster
By licence
https://www.freereg.org.uk/search_records/683b749f8655740fb9a8b979