Install switch on spur for outside light

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Hi all

I've got an outside light to the front of the house, which is wired with a single cable (permanent live / neutral / earth) wired into the ground floor lighting circuit (I assume from a spur from a junction box somewhere). The cable runs through a front cupboard where I would like to put a switched light, although as this cable is itself a spur it obviously has to be a slightly non standard setup if I am to use this cable.

Am I OK to cut the wire in the front cupboard and use a 4-terminal block (in a chocolate box) to wire up the new light (60W energy saving) and switch along with the existing front light (60W energy saving PIR - so still permanent live) using the same setup as this:

View media item 68432
The only difference to normal is that 'supply to next light' implies this is a ring circuit, whereas obviously the 'next light' is the final light on this spur. The circuit itself is nowhere near full capacity.

Any advice appreciated - thanks in advance!

Matt
 
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Ignore the "supply to next light" connections in the drawing.

PS lighting circuits are radials, not ring final circuits.
 
Oops - had forgotten lighting circuits are not ringed, and therefore adding another light in the chain is fine… :)

Thanks!
 

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