Hello Everyone
Just to confirm, after much trial and error, these are the sizes I needed on my M3W (early 2012)
Front - M10 x 1.0 (2no.)
Rear - M7 x 1.0 (1no.)
Following several unsuccessful purchases I have now built up a 'stock' of M8 X 1.0, 1/4" x 28 & 3/8" x 24!
Regards
Andrew.