Just to save anyone looking up the information (sorry, should have included it in my first post),
the 'Quilting' needle sizes are -
Size No. 9, Dia 0.56, Length 27.3mm.
Size No. 10, Dia 0.56, Length 25.8mm.
Size No. 12, Dia 0.51, Length 22.7mm.
and the 'Quilting Between' sizes are -
Size No. 9, Dia 0.53, Length 27mm.
Size No. 10, Dia 0.46, Length 25.4mm.
Size No. 12, Dia 0.53, Length 24.4mm.