Hi Stuart,
I have a Speed 10 and it came with the following gears.
On the lathe for finest feed the following are fitted: – 1st stud 65T, 20T, 2nd stud 70T, 20T, Leadscrew 75T. Extra gears are 25T, 30T, 32T, 35T, 38T, 40T, 45T, 50T, 55T and 60T.
As far I am aware that will cover Imperial and Metric screw cutting listed on the gear cover.
Hope this helps.
Luigi