Mark, I got it sorted. I initially tried using Eki's Overcaster plugin, the effects were great, unfortunately it interfered with the way i have my pacman character animating. I have it switching very quickly between different models, each one made to represent an original animation sprite from the real game, 4 in all. These shrink and grow in the same spot very quickly so it looks as if its just animating normally.
Because overcaster uses motion blur, it caused this switching to be visible. However, I tried the other method you suggested and also added another light below and this worked perfectly.
Thanks.
