Some months ago I got an electrician to fit a couple of light bulbs and some electrical points in the attic. I got some guy recommended by another guy doing some work for me. Anyway all went fine but he said that the switch for the light in my hotpress was linked to the cables (that were already in place) in the attic. So I need to switch on the light in the hotpress when going up to the attic. That's no problem. However until this weekend I had not replaced a light bulb in my landing which blew several months ago. When I did I could not turn off the light - I have three switches for the same light and none of them switches off the light - always on. Now I could go back to the guy who did the work if I can find his number but was wondering if someone could tell me what might cause this ?