Ran it today and at about 40 % with a pully gearing of about 1- 2.5 and it ran fine . Switched on by my Bob relay, and handled some pretty reasonable cutting loads without stalling or apparently overheating and its on board fuse did not appear to be challenged by half an hour of running.
So it will allow me to play while I decide on a more permanent option.

Looks pretty uncomplicated inside too . It has a pot too so wonder if PWM could be added instead .
Clearly it is not designed to handle the TCL Motor but wonse what it might take to build a beefed up version.