I've worked it out.  If anyone's interested I did change 
mathed/math_support.C such that

  diff mathed/math_support.C mathed/math_support.C.orig
  555c555
  <     {"textrm", LyXFont::ROMAN_FAMILY, inh_series,LyXFont::UP_SHAPE,LColor::math},
  ---
  >     {"textrm", LyXFont::ROMAN_FAMILY, inh_series,LyXFont::UP_SHAPE,LColor::black},

Regards,

Paul Stansell

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