Thanks for that information much appreciated. Since posting I have found that Thomas was possibly still in Qld when he died but have found nothing there either.
Still think that there is a connection between Catherine Wall (nee Ryan) and Thomas but cannot quite put my finger on it.
Thomas' first wife was Margaret Wall - William's sister and as immigrants believe they would have hung out together and that is why I suspect that Catherine was related to Thomas but just cannot prove it.
Catherine's death Certificate states she was born in Cork which is an adjoining county to Tipperary where Thomas' was born so suspect that they are relatives possibly cousins.
I do know that Thomas' parents were John and Julia Ryan and that he was living in Mt. Moriac when he married in 1850 but cannot find anything from there about any relatives.
Thanks again for your help