Got a response from arceurotrade.co.uk

Metric Machine:

X & Y 12mm x 2.0mm pitch
Z 10mm x 1.5mm pitch

Imperial Machine:

X & Y 12mm x 20 TPI
Z 10mm x 16 TPI

This is handy if you want to know how to tuning your motors. But remember that Imperial Machines use metric screws too!