I have moved into a property. The previous occupants removed the light fitting in the hall and did not leave any indication as to what two wires should be used. There are 3 twin and earth cables ( in red and black ) and one cable with red,blue and yellow wires plus earth. All wires are wired into 4 plastic blocks. The three red and black cables are wired as three reds and three blacks, the the red blue and yellow cable is split into red and blue and the fourth block is just yellow. I believe this is double switched.
Please can you advise me which blocks I use for the light fitting. Many thanks