Hello Ray,
Yes, this is the correct person! I have his birth certificate.
On the certificate, 7 Upper Grove, South Norwood, Croydon is listed as his place of birth, but it appears to be just a residential address.
Violet Kemp Horn was born in Gourock, Scotland in 1872. She marries George's supposed father, William Horn, in 1896 in Taltal, Chile. There were no children born whilst they were out there. William runs away in 1902, leaving Violet in Chile. By the time she has returned to the UK in 1902, he had apparently already left for Australia (surely ruling him out from being his actual father).
She appears at a Scottish address in Gourock/Greenock, in 1911, with just a lodger. After many, many searches, I have never found George Lamont or William on the 1911 census. She leaves for Australia in 1922 and dies there, alone in 1946. It appears William died the other end of Australia in 1915.
I have never found anything for George from his birth certificate in 1903, right up until the early 1930s, when he gets married and has his own children.
I'm hoping to find out who she is with at the time in 1903. Maybe I'm clutching at straws, but there is a whole clump of people on my DNA matches, that I cannot fit into my tree. And the same surname keeps popping up. This particular person would have been in his 30's when George was born and had children around the same time with his wife.
Violet was from Scotland and there is no reason why she is suddenly staying at a house in Croydon? It doesn't make any sense. The person in question above, lived in Sussex, not far from Croydon. And George actually spends the rest of his life in Sussex.
Best wishes
Chris