The plate is just 1mm thick and wall boxes should be recessed into the wall to achieve a flush finish. Each switch does need to be earthed and is designed to fit into UK standard wall boxes. Covered by the Varilight 10 year guaranty.
Heavy Duty Metal Clad 20A Double Pole Switch with Neon with Back Box
CED AXIOM 20A DOUBLE POL SWITCH WITH NEON INDICATION IDEAL FOR HEATERS/BOILERS
Deta G3556 20A Double Pole Grid Switch marked 'Dish Washer'-White
Deta G3514 20A Double Pole Grid Switch
MK Electric K4915 WHI 20A double-pole 1way push-to-break switch module Grid Plus
G3554 DETA 20A Double Pole Grid Switch 'Washing Machine' - White