I have removed the motor & ESC from the Excalibur V2.
At this point in time I have no idea why the motor stopped working & then upon landing was only cogging rather than running up to speed.
I’ll sleep on it and double check it all again in the morning before reassembly.
Update. I have sent a warranty request to HK for a replacement ESC. It seems to be the problem, same as my Slow Poke was.