The Josiah CLARKE, aged 26, married to Caroline, living in Bedford Street, Woburn with children George, William, Susannah and Henry in 1851 is a grocer and tea dealer which ties in very nicely with the Josiah CLARK, son of Josiah (a grocer) and Ann and brother of Edwin and Rice in High Street, Great Marlow, in 1841. Do the occupations fit those on your Josiah's marriage certificate? Who witnessed the marriage?