Hi there,
Regarding plug sockets.
The majority of sockets are built to poor standards, any stocked items in Screwfix such as 'LAP', 'BG Nexus', 'Marco' etc steer well clear. Nobody will sell their product cheap if it is good quality. Shnieder Electric have brought out the Lisse range in order to eventually replace their Ultimate range. MK use terminal screws made from soft metal to prevent reusing them. BG breakdown internally so you will have 2-3 not working within a year. All sockets with USB's use cheaper components to save on cost (click the switches and compare with one of no USB). Most manufacturers use a cheaper socket for their metal plate ranges. Some sockets have sharp edges that dig in to the wall plaster causing unnecessary damage, Crabtree plastic range are unnecessary thick, Click flatplate have an unnecessarily thick rubber seal to the wall making them look loose, BG brushed steel range has a film to prevent finger marks.
Shnieder Electric Ultimate range are very well made. Flatplate range have a soft foam seal to fit snug to the wall without damaging the wall. Use the same socket components across the range (except sockets with USB). Huge product range. Nice soft click on the switches so it doesn't vibrate through the whole house. Brushed steel shows finger marks and extremely hard to clean. Excellent price across the range but use single pole in the metal ranges due to huge price difference. Slimline white plastic, flatplate polished chrome, black nickel.
LAP cut corners such as having a shared common on a dual dimmer switch making upgrades impossible, or even upstairs/downstairs lighting.
'GET ULTIMATE' range that has been bought out by 'Shnieder Electric'. They use the same quality socket for their slim white plastic as well as their chrome metal. Do not touch their other ranges.
Retrotouch do a Simplicity range that give an elegant look, great for fashion conscious, also great price and perfect for elderly with the wide switches. Superb customer service and do ranges with remote RF control.
Heritage Brass are expensive but do a larger range and also have great customer service.
You will need to speak with your Electrician about intermediate light switches etc although with sockets 'double pole' means the switch will break the live and neutral meaning that appliances plugged in to a 'single pole' with a neutral to earth fault would trip RCD's (fuses in the fuse box) with the switch off, so if you get tripping you will have to unplug everything instead of just the switches.
To sum up I would recommend the hard to find black nickel Shnieder Electric Ultimate and purchase from Edwardes Electrical for a good price and service. Homebase used to sell them obviously not that cheap.
A 1gang socket is a single socket and a 2gang is a double socket.
Regards,
Laurence