Hello again. Coming back on this one after a bit of research (on the forum - thanks originalgavman) lead to a solution.
I regained control of the factory reset by resetting the remote as follows :-
Please try the below troubleshooting steps in order
1.Remove the used/old batteries on the remote
2.Press the ON/OFF button multiple times, this is to discharge any electricity inside the remote
3.Insert a fresh pair of batteries in the remote
You can reset the remote control to the factory default settings.
1. Direct the remote control to your box.
2. Press the Power and RED buttons at the same time for 5 seconds until the red LED blinks three times. All the settings will be reset.
3. With the default settings, the remote control will operate in IR mode.
After this I pressed the yellow button to skip Bluetooth pairing and carried on to finish the factory reset - all was well except I had to reset my recording schedule.
To see the post that helped me go here - https://myhumax.org/forum/topic/humax-aura-issues
Just waiting for Humax to respond now, interesting to see what they say.