Hello!
Apologies for the late reply. The USB Hub that was used in the original post *was* powered from the mains. The problem seems to be with the USB connection for some reason, I'd hear the Surface 'chime' about 10 seconds after plugging in the display->hub->Surface and then the screen just freezes and remains unresponsive, doesn't appear as a secondary screen in display settings but still appears in device manager.
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