Thank you both for your replies.
Family Law said that my great uncle was killed by a runaway horse and cart when he was a child, his name was William Humphrey. I found 2 births one in Jul-Sep 1894 for William Arthur and one in Oct-Dec for William, a family Prayer Book has written in it that his birthday was 9th October. The 1901 census confirms we was born 1894. In 1905 I found the only death for a young William Humphrey between 1901 and 1911, his name William Arthur. In 1911 cencus William is not shown. The problem is that the birthday written conflicts with the evidence that my Great Uncle was William Arthur. I was clutching at straws realy, I expect I will have to spend out for at least one certificate.