Hi just a quick note if you want to put a WiFi switch in that uses a neutral, turn off all electricity at the fuse box, take out the backing plate and make required depth, replace the light switch backing plate in the wall which is usually metal with a deep plastic backing plate which then frees up the earthing wire to use as neutral, install your switch using the earth as neutral and then make sure to do the same in your light fitting. This works perfectly and is safe, I have done this in my own home and have had no problems, I’m no electrician but the basics are very simple. Please do this at your own risk I am only stating how I personally set a WiFi switch up thanks