Route details and GPX file can be found here -
A step-by-step guide of how to upload a GPX file to your Garmin device can be found here -
PDF course maps for both can be found here:
Download MMT (S) Ultra Map - Kington to Ludlow Map
Download MMT(S) Croft Half Map - Aymestrey to Ludlow
Disclaimer: The organisers reserve the right to amend the routes when necessary.