This is the inside of an electric shower switch... can some help me understand why the cable is burnt and also is this a "2 gang" switch and will it need replacing? :
Cooker or Shower Switch with Indicator Light 45 Amp Single Plate - Goodwins
Switch supplying power to electric shower isn't working? - www.ultimatehandyman.co.uk
50A Pull Cord Shower Switch | Heavy Duty 50 Amp Double Pole | Click PRW211 | eBay