Sorry for the delay, I've only just found this forum.
William Rendle and his wife Jane (neé Taylor) were my great-great-parents.As you say, he was born in Woodleigh (christened 19 September 1806, parents John RANDALL and his wife Mary).William and Jane were married 30 December 1829 in Bigbury (Jane was "of this parish" but William was not).They apparently had eight surviving children, of whom my great-grandfather George Rendle was the sixth; but the Blackawton census records seem pretty inconsistent and it isn't easy to be sure.
But it looks as though their children were : John born 1830-1831 William born 1830-1832 Mary Jane born 1833-1836 Thomas born 1841-1844 Gilbert born 1838 George born 6 November 1840 James born 1847-1850 Catherine ("Kitty") born 1850
William died in 1879, and Jane in 1887.
I haven't yet managed to find William's parents John and Mary, but I have found a marriage between John Rendle and Mary Gay, 3 August 1798, in Ringmore, which of course is next door to Bigbury; could be them !