there's a single red on the right and then two twin reds in the middle
If you untwisted all the wires...
(Don't though this is just talking through what you have actually got)....
You would see there are four physical cables:
3 which have 1x black & 1x red wire (called Twin & Earth)
1 which has 2x red wires (called Twin Red & Earth)
The three Twin & Earths cables have:-
Black to left hand terminal.
Red to middle terminal.
The Twin Red & Earth has:-
1x Red to middle terminal.
1x Red to right hand terminal.
As the guys have said your light fitting has Blue to the black & Brown to the single red.
With the earlier picture it is a similar arrangement but a Red/Black Twin & Earth is used where the Twin red is on the second photo.
e.g. First Photo....
You would see there are three physical cables:
Which all have 1x black & 1x red wire (Twin & Earth)
Two of the three Twin & Earths cables have:-
Black to left hand terminal.
Red to middle terminal.
The third Twin & Earth has:-
1x Red to middle terminal.
1x Black to right hand terminal.
As the guys have said your light fitting has Blue to the left hand black & Brown to the right hand black.
THIS IS ASSUMING YOU HAVEN'T PREVIOUSLY UNDONE ALL THESE WIRES....
If a Twin & Earth had been crossed over it is possible to blow the fuse by accidentally connecting the switch directly across the supply.
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