Hi Rick
According to a marriage certificate that I have, at Sept 14th 1851, Thomas Chapple (Chappell) (b Enfield c1832) and Mary Griffiths (b Bristol c1827) were living at 17 Brook Street. They may not have been there at the time of the census but were probably in the area somewhere. I'm assuming the parish is St Giles as that was where they were married.
Thanks for your help.
Jackie