As for WILLIAM HILL he appears to be living at
1841 census
Birdcage Alley, St George the Martyr, Southwark, Surrey
WILLIAM HILL 10 Y (BORN IN SURREY)
he is living in a large household where
every adult (15+) of which their are 10 was born in IRELAND

I'm curious................how do you know he was a ventriliquist? from his marriage cert, if not? what was his occupation and his father George's occupation on that marriage cert?
Bryant