Thanks Grendel and Brian for your further assistance.
These added tips have made an enormous difference to the quality of renders!!
I noticed that in Patrick's example and reply to yourself Brian that translucency is discussed - is there a specific recommendation for this setting and what does translucency bring to the render quality ?
I notices as well as caustics being turned on fresnel in reflection is also recommended.
Aside from specific render setting recommendations other tips are:
soft box for local reflections
background for reflections
Use a grunge map to mix reflection
values and bump values.
Many thanks.
p.s although it's a Lightwave tutorial I found this great link for setting up a bottle of Jack Daniels
http://www.the123d.com/tutorial/ligh...aniels01.shtml