Whoever installed it use random combinations of the colours. The red cable on the bottom right is the (isolated) line from the house, light blue is neutral and the unsleeved cable is earth. However, the socket to the left of it (slightly out of pic) was wired yellow to live, blue to neutral, unsleeved to earth, as was the garden socket! The two lights had red for live, blue for neutral.
The two cables going down went outside to socket and one light, both buried under the patio, but were shorting across the blue and unsleeved, so they were disconnected and cut back. One the cable going up went to a light onthe wall of the shed, which was also shorting and was removed completely. I rewired the socket with the correct cable and sleeved up the rest to the correct colours.
To cap it all, this was connected to the upstairs lighting circuit inside the house!
