Diane, I am not sure whether I have emailed you before so please excuse if I have.
On my family tree I have a Rebecca Biddlestone christened 12 Jan 1806 at All Saints West Bromwich. My research has Rebecca's parents as Isaac Beetlestone and Rebecca Withers who married 14 Mar 1790. Around this period I found the surname varied quite frequently between Beetlestone, Biddlestone and Biddleston. Would this be your Rebecca?
Isaac, christened 1 Jan 1770 at All Saints, was the son of Isaac Biddleston (withoue the "e") and Mary Wyley who married at All Saints on 18 Apr 1759. I descend from another son of theirs, William christened 24 Aug 1766 who married a Rebecca Mallett. William's grandson, also William, came to Australia around the 1850's and settled in the state of Victoria.