Taking a spur from a single socket

[manyhands]

I have taken a spur to serve a double socket, from an existing single socket which has two sets of wires coming in.
The socket works with hairdryer, tumble dryer, but will not work when I
plug my outside PIR light into double socket. (Light works in original single socket)
Can anyone advise what I've done wrong???

 

[ricicle]

Double check the polarity of your connections (ie are they in the right terminals at the single socket end and the double socket end)

 

[manyhands]

I've checked the connections, I have three red, blue, green in the single socket (including my spur wires), and one each in the spur double socket .