Yep. Got the grounding thing
I have a variable psu (0-30v 0-10A), so as long as I don't turn them all white I should be fine, I think.
Am back at home now, so have had a proper look.
There are two sets of three wires and one set of 2.
The 2 are red/black power, seemingly in-line with the red and black of one of the set of three.
1st set of three (male)
2nd set (female):
That has baffled me properly now!
Ps. Thanks for your time and effort on this. Really appreciated.