I have since found that the Dualit DMF2 is really the same machine, same electronics, maybe a tweak to software based on the “calibration” Hotel Chocolat say they have done.
Found a teardown and repair of that which had what I wanted https://helpfulcolin.com/repaired-dualit-milk-frother-model-dmf2/
If you are looking to fix your this Dualit model is half the price of the velvetiser.
Regards
Ray