I guess your referring to coiled up red, I would guess at some time in the past you had storage radiators and the top fuse box with no fuses would have been used for the storage radiators, and the cable has been removed when storage radiators were removed.
Thanks for replying. I should have made my highlighting clearer. I'm actualy asking about the grey cable that goes from the 100A fuse to the consumer unit. If you zoom in on the picture you can see I've drawn a box around it. Thanks
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