I've just changed a light in my front room. On the old fitting it had a long type terminal block with 3 reds, 2 blacks together, a single black and a yellow wire with all the earths connected together and a blue and red connected together in the ceiling. So I connected the 3 reds together, the 2 blacks which went to the neutral on the light, the single black goes to the live, the yellow is on it's own and the earths are together. Now I've managed to take the switch in the room out and the front room light turns on with the hallway. Any ideas what I've done wrong? I'm trying to do it myself without pestering the sparky at work again.
Thanks
Thanks