Hello Mark,
I am not connected to either the Dicks of Lemon families, I merely helped Penninah with the research.
While investigating the family I contacted one of the researchers at the JGSGB (Jewish Genealogical Society of Great Britain) who had developed and maintains a database of the Jews in Britain in 1851. She informed me that there was only one family in Frome at the time. By the time of the 1851 census they had moved to Bath (I think).
Justin