New build apartment, around 4 - 5 years old. I have 4 x GU10 fittings in the kitchen which are controlled by a switch on a 4 x wall gang of switches (one switch turns all 4 x bulbs on or off, other switches are a dimmer for the living room area, switch for desk area and a 4th unknown switch). About 3 weeks ago one bulb blew, tripped lighting circuit at fuse box (happens with GU10 bulbs from time to time). Replaced bulb, didn't work. Replaced with another new bulb, still didn't work. About 2 weeks ago a second bulb blew, same as above - so 2 of the 4 aren't working. Fast forward to yesterday and third has now gone, same as above. On checking the the 4 x gang wall switch: - 2 x switches have brown and blue going to them (makes sense to me). - Third switch (kitchen) has blue, with brown being a short cable connected to same connection on fourth switch (which doesn't control anything) - Fourth switch in turn has blue and brown as well (but as above this switch doesn't switch anything on / off?) - I also have 4 x yellow/green going to a corner of the blanking plate (ground?) Image attached, from left to right: - 4th switch, unknown - 3rd switch, kitchen area - 2nd switch, desk area - 1st dimmer, living room area Two questions: 1. Why would the bulbs stop working in the fashion described - what should I check for? 2. Why on earth would the 3rd + 4th light switches be wired as described above? If this is a job above me please do say - would rather get an electrician in to get it put right. Any advice much appreciated.