This post is a long time ago, but for the record I will add some information. I am researching a Horatio Nelson Powell, and this man was born in Abergavenny and bpt in 1806. His parents were Jane (nee Price) and John Powell. (see
https://www.freereg.org.uk/)
John Powell was well-to-do, a RN surgeon and solicitor (so described in daughter's obit); Welsh Horatio was privileged and described as 'Esq' in newspapers.
Welsh Horatio became a well known steeplechase rider, as well as a sometime solicitor. (newspaper articles). He moved to Australia in late 1850s, early 60s. He died in Echuca, Victoria, Australia in 1869. A newspaper article describes
"I see that Mr. Horatio Nelson Powell is dead; he was one of the most celebrated steeplechase riders in the old country in his day. He lived for many years near Hamilton, but had lately gone to reside at Echuca, and was present at the late V.R.C meeting. Some internal injury from falling out of his buggy was the cause of his death."His death registry index (no 8994/1869 from BDM Victoria) states his wife on the certificate is 'Susan Jenner' - although his probate states another woman, seemingly a common-law, is his current wife. Additionally my Horatio is from 'Wales', aged 63 (matches my 1806 bpt) and father's name is John.
So I don't think the Horatio Nelson Powell in this original post married Susan Jenner....?