Bits and pieces....
TNA
Records of Sun Fire Office
MS 11936/511/1069433 19 December 1827
These documents are held at Guildhall Library
Contents: Insured: Christian Benzing 6 Old Montague Street Spital Fields chandler and dealer in clocks
If it wasn't for the 1812 marriage is would be easy to say Christian (1781) and his wife Ann arrived in the UK around 1820 with any children (inc Christian 1804). They then had three more children here inc your Ann, but the marriage wrecks that if it is the 1781 Christian marrying.