My neighbour asked me to fit a dimmer switch for her, I am a keen Diy'er.... I also have an electrical qualification from years ago... but I haven't used it... When i Opened the switch... There are 3 brown wires in it. 2 to COM and 1 from L1, there are some Earth wires at the back.. The wires are run in old trunking... on surface, it is an old Trust building block of flats. Is this a drop down wiring thing, because it doesn't seem to cover the normal... Do you envisage any problems just putting a dimmer switch on, Lastly, The lady wants an Led bulb, Is there a dimmer especially for such low wattage, so that i don't get flicker which is something i remember happening to me in my own house, i just binned the dimmer.