George Levi KNIBBS 

1876-1962

Based on this letter of reference, we can calculate that George went to work for Thomas Wright in 1898 at the age of just 12 years.

Thomas was the owner of St James Farm at Clifton. He was also George's uncle as he was married to Sarah Knibbs, his father's sister. 

I know George later worked for the Great Western Railway, but I am not sure if that was his next Job after he left St James Farm.