I have removed my bathroom light pendant to fit downlighters. There was a spur from the fitting to a shaver point which I removed, however, I am now left with 4 wires coming from the ceiling. Red blue yellow and earth. But the light switch is red and black! I have tested the ceiling wires and the red and yellow are live even with the switch at the off position. I am getting 150v. Help! Just need to know what wires are what.