Oops, silly me. Father is Thomas Ettridge, a painter.
Here's the full transcript of the cert:
15th Dec 1873
Charles John Ettridge full age bachelor Carver 4 Pimlico Wall Thomas Ettridge Painter
Eliza Sarah Ettridge minor* spinster -- 1 Pimlico Wall Edward Ettridge Fishmonger
married after banns by T(?) H. Wright
witnesses: Thomas Ettridge and Rebecca Farrington.
* Eliz's dob is 10 Dec 1855
I suspect Rebecca Farrington is another Ettridge (though not entirely sure of her parentage yet), as there's a Rebecca Ettridge marrying a John George Farrington (1871, Q2, Shoreditch, 1c, 338; IGI Batch M040371).