So in Sept 1843 there was a Dr BENSON, MD MRCSL at Beau-Desert on the Coombing Estate ... which had previously been occupied by a Major BOWLER .. and that card ... it mentions CARCOAR ...
Back shortly !
Edit 1 Yes, the Cooming Estate is in the NSW electorate of CARCOAR, and not to be confused with Beaudesert in Queensland
Edit2 Dr Barker J BENSON 's wife (Hannah) ... her probate packet has been indexed and it clearly shows the address linking her to him. Probate packets sometimes contain very little family history info BUT usually they have lots ...
http://srwww.records.nsw.gov.au/indexsearch/keyname.aspx There is now a photocopying service for the files from that Deceased Estate index.
Edit 3So in May 1842 Barker Joseph BENSON was up at the Brisbane Waters district around Broken Bay NSW, and in Sept 1843 he was over the Great Dividing range around Blayney, Carcoar etc, and I wonder where he was in August 1844 ... His sequestion ended 21 August 1844.
Edit 4And in May 1867 the Surgeon, Barker Joseph BENSON was found to be insolvent, but had cleared the debt by 3 Dec 1867 ...
BUT these are only index references, and to get to the nitty gritty of Carna's question (was he a quack or was he properly qualified) perhaps there is information in those sequestion files ... particularly the 1840's ones ... that indicates his medical standing at that time.
I cannot find how to link Dr BENSON at Carcoar in 1843 with Carna's Barker Joseph BENSON , ...

Have I missed something ... please help, it is very confused, I can find quite a number of Dr Benson chaps in what was NSW in the 1840s ... I can find others with that surname in NSW in the 1840's
Cheers, JM