Walter Taylor David Powell, (I have not heard of the 'Frederick') my great grandfather came to Australia in 1852 for the gold rush. (His father was definitely, Walter Posthumous Powell) He returned to England but came back to Australia in 1854. After a rather eventful life, he died in Brisbane, Queensland on 23 December 1906. I have a fairly extensive history of his life here in Queensland if you are interested. I am interested in finding out more about his siblings, so if you have any information I'd be grateful.