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Have purchased 3 light up shelf units.
All 3 run off one plug. The only wire I'm not sure where it goes is the brown on the left. There was a loose screw in the block so the seller must have taken a wire out of there.
Am I ok to turn it on ?

you can but its wont work.
Where do each of the three cable go?
without knowing exactly whats there Id say you will want all three brown wires in the same terminal block
So if I double up one of the brown wires I'm ok?
Yep, Just connect all the brown ones together. You can put two into one screw terminal or move them to the three way terminal (I'd go with the second option)
Also, buy a decent PZ2 screwdriver bit
Maybe I'm being dim, but if there's 3 lights, shouldn't there be 4 cables. One to each light and one to the plug?
There is a plug on unit one. Then wires to 2 where the pictured box is then wires to 3.
put all the browns together and you will see the light
That worked. Thanks.
You might want to tidy up the neutral connections too... I can see quite a few loose strands sticking out of the connector.