OK I see - they/v2 is the same width as a UK plate @ 80mm, the height is 125mm , which is taller than the 80mm of the square UK plates, so if the gubbins doesn't extend beyond 80mm you should be ok using existing box. - why haven't they made it the right size though - uk market too small ?No that's the V2 one. The V1 version (which had different symbols for the on and off buttons) was narrower and couldn't cover a UK light switch box. The new V2 one (which you've linked to) is a tad wider, and just wide enough to properly cover and screw into a tradition Uk light box socket.