Thanks for your help so far Slime, but neither of the examples you've
suggested has hit the nail on the head as it were.
I've included the scene below, hoping you can see the obvious thing I've
missed...  Run it to see the current syntax problem...

#include "colors.inc"

camera {
  location  <0, 5, -40> look_at   <0, 0,  0>
}

light_source {<-200, 1000, -400> White}

plane {
  y, -20
  pigment { color rgb <0.7,0.5,0.3> }
}


#declare myObject = union       {
        cylinder        {
                        <8,0,0>,
                        <-8,0,0>,
                        3
                        }
        sphere  {
                <0,0,0>
                ,5
                }
        };

 sphere {
        <0,0,0>,
        10
        texture { pigment { Clear } }
        hollow
        interior        {

          media   {
                                scattering {1, 0.1}
                                intervals 1
                                samples 5
                                method 3
                                density {
                                        object {myObject rgb 0 rgb 1}
                   }
                                }
                         }
        }

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