Hello I'm Zani and I'm new.

I am having great difficulty tracking my husband's grandfather's ancestry. What I have is the following:

Arthur Walker
Born in London on 29 March 1886
Educated at Highfield College, Chertsey, England
Son of William Walker (we don't know what the mother's name was)
Two siblings, Rose and Daisy.

In 1901 he came to South Africa aged 15 as a horse handler with the Imperial Yeomanry, later he was a scout and was wounded. He was awarded a good conduct medal and was given a disability pension.

What I did find was this, but not sure it is him:
Walker, A. 35809, Trooper Imperial Yeomanry

Any help would be appreciated!

Thank you.