That last is a power point or power outlet. The plug is at the end of the appliance cable and is instered into the power point.
Nowadays, thanks to our nanny masters in Brussels, ALL electrical appliances come with a sealed on plug which can't be re-used. This is to protect us.
Before that legislation appliances didn't come with a plug so that we could re-use the spares in our drawers or transfer the plug from our old applicance which was being replaced.
There's also the point that before Brussels took us over there were several sizes of power points. An applicance was left plug-free at point of sale so that the appropriate size could be fitted.
It used to make sense. Now we all have had to have a standard size and type of power point and it's cost a lot of money for householders to have re-wiring done. And it isn't finished yet because it's likely that Brussels will change the rules again for Brits so that we have to conform to exactly the same types of supply as continental types. That will also apply to newly admitted countries to the EU, such as Poland, Ukraine etc., whose populations tend to be poorer than those in the west..
It means a lot of work and inflated prices for electrical work (most of which we're not allowed to do ourselves - although some of us do) and an awful lot of waste.
It's madness on wheels.
Mary