I have just fitted a new mains voltage halogen spotlight (3 spotlights) in our smallest bedroom. using the fourway terminal block supplied I have connected three red (live) wires to the left hand connector, next to this what I believe to be the switch return, next to this the earth wires and next to this what I believe to be the two mains loop wires. I switched the new lights on and they work fine. Unfortunately, switching that light on now switches the bathroom light off. Now when the bathroom light is on and the spotlights are off the lights in the other bedrooms lights are dimmed. The lights all work okay independently provided none of the other upstairs lights are on. I have also noticed that if a light is on in one of the other bedrooms the new spotlights have a faint glow. Any ideas?