Since central records have been maintained in 1837 I cannot see any marriage for a Lath with a first name resembling Helman or Henrick anywhere in England. There was one marriage for a Dinah McCoy but not in London and she did not marry a Lath.
Found the following:
Dina Lath in the England & Wales, Non-Conformist and Non-Parochial Registers, 1567-1970
Name: Dina Lath
Birth Date: abt 1820
Event Type: Burial
Death Date: abt 1855
Death Age: 35
Burial Date: 31 Dec 1855
Burial Place: Hackney, Middlesex, England
Piece Title: Piece 0042: Hackney, Victoria Park Cemetery: Burials. Vol 1 Indexed, 1853-1855