Hi, witnesses at Robert and Edith's Wedding were his Father, Sydney and her Mum, Mabel so not much help really.
Regarding Winifred, I'm afraid it's a Family rumour that I'm perusing at the moment. My elderly Aunt says that she was told that Win was her Dads Half Sister and I've recently been in touch with one of her Daughters, Blanche, also elderly with a poor memory, and she refers to my Grandfather as Uncle Bob and my Dad and his Siblings as her Cousins. I do have Winifred Clements Marriage Certificate but no Father is given. She was born in 1906, possibly Slough. Her Mothers name was Clements. She may lived with Nuns at some stage I think. Richard Downs aka Ihonart left his first Wife and ran away with Edith Sewell, never marrying her but assuming her last name. There were somewhere between 7 and 13 Children but I have the feeling that if he was her Father, Winifred was the product of a 'fling' between his 2 Relationships. It's very very complicated!!