The regulations vary from country to country.
BG 8222EM8 WHITE ROUND EDGE 2x 2 Gang DP 13A Switched Socket 8 Euro Module Home
2x 1 Gang, White Switched 13A Single Mains UK 3 pin Wall Power Socket Outlet
2X 2 Gang 13 Amp Switched Socket with 2 USB Charging Ports Satin Chrome Grey Ins
2x 2 Gang 44mm Single Metal Heavy Duty Back Box to Match Knightsbridge M Series
Dencon 2 Gang White Finger Plates for Light Switches & Double Sockets - Pack of 2
