The plastic switch component on my tennants bathroom light switch has come off. I went to change the switch and found a lot more wires behind than I was expecting. Bit of a novice with this sort of thing but felt confident after watching a video on YouTube. Was just expecting a one way switch. The internal connections were labelled L1,N1 L2 N2. Can anyone point me towards the right kind of switch from b&q/homebase? Thanks in advance.