Thank you for your help.
A careful read of the LaTeX manual reveals that \mathbf, \mathrm, \mathit etc
change the style only of leters, numbers and UPPERCASE Greek letters. Hence the
need for something a little more drastic to obtain LOWERCASE Greek letters.
Stephan, your fix is essentially the same as my own. I find that what works
best for me is:
\newcommand{\bmath}[1]{\mbox{ \boldmath$\!\!#1$}}
The formatting here is Ok and \( a \bmath{\omega} b \) gives me
a bold omega with normal a, b on either side. Importantly, there are no large
spaces between the three symbols.
What a faff!
Angus
