This is a 20 amp flat polished chrome DP switch from G&H Brassware.
The plate has a polished chrome rocker switch with white inserts. It is a double pole switch. It is fitted to a matching polished chrome switch plate. There is a neon light that illuminates when the switch is in the 'on' position.
Please don't forget, you will need a 25mm back box to fit this plate.