Make sure you drill a small (3mm) hole in the bottom of any IP rated boxes above ground level. Moisture will always get in, so you need to give it a way to get out...
Swa cw gland terminated correctly comes into the socket box on 4 core with 2 cores earthed as one is spare. Going around the garden, one of the cores is then used as the second switched live.
The swa goes to a 3way ip68 jb, one to the light fitting and the other to the next jb.
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