Quick Block Mains Supply

If like me you are forever needing to test electrical items quickly and can do without fussing around looking for the correct mains plug for something that you just want to test the store, then this is for you.
I have seen these for sale commercially and they go from £25 - £50. So I decided to designed one from scratch and build it myself for under £10.
Firstly you are going to need an illuminated power toggle switch, 3 springs and 4 small screws. The screws you will probably have kicking abo