Thanks Jim, that is most helpful! I wasn't aware of the "Select Connect Objects" command. (I am fairly new to VW). Using what you have posted, I have come up with a usable method (which will pass, for now)!
I trace the bitmap, ungroup the lines. Select everything, "combine into surface". Fill the area with whatever colour is selected and move the solid out of the way. Delete the original trace lines. I think take the "surface", run "bezier spline smoothing" and then convert the solid back to lines. Works a treat and tidies up all the rough edges.
It would be better to have more control on things like trace and the bezier spline smoothing tool sets but for know, it will do!
I appreciate your prompt reply!
Regards,
Duncan