Can you please ensure you include all available info. The 1854 death in Cardiff was John Jonathan Hodson and he was 26 at death giving a birth year of around 1828.
The 1851 marriage you quote was just John Hodson
Your opening post says Eliza was b Somerset but the 1841 for Gloucester shows her as born in county (ie) Gloucs. Where is Eliza in 1851?