Hi Lyn, There was a Mary Elizabeth Venables married to a James McKay Bishop about 1867 in the Orange Free State, South Africa. She died in 1887. Her father was Thomas Venables born about 1811 in the U.K. and his wife was Frances Sparks.
There was a Daniel Venables who was born in Wales in 1772 and died on 5 Sep 1833 in Grahamstown, Cape Province, South Africa. Apparently, his wife was Jane Hunt, who was born about 1774 in England, and died 9 August 1863 in Grahamstown, Cape Colony, South Africa. They had 5 children. None was called Daniel. There is a 7-generation file on Daniel. This might or might not be your Venables. Let me know.
I hope this helps a little,
'vangasser'.