Many thanks for the help, all. I've got a pretty good idea of what to do
now. I'm going to use a second media-sphere to contain the
turbulence-casting media. The current flame uses "no_shadow", the shadow
will use - ah, whatever the keyword is for invisible objects. This should
allow me to adjust the two effects independantly, I hope (dunno if this is a
good idea, but if so I offer it as a top-tip).

The flame is probably a bit tall - it's been 20 years since I was very near
a lab (or at least one with a lit bunsen).

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