Thanks you everyone, it's great to have help.
Yes, Samuel was the father of the other children, he is certainly hard to find even using other variations of his surname, it's almost as if he didn't want to be found.
I hadn't seen Adelina and Lulu on the 1933 electoral register in Surrey, not sure why they were there but it could have something to do with Lulu marrying in 1935 in Easthampstead Berkshire which I think is near the border of Surrey. Adelina's death in 1935 must mean she moved back to Devon after 1933. Would her death certificate indicate whether she was a widow?
Can you tell me Milliepede whether Samuel is on any of the electoral registers?