The Kiddiproof socket cover has been a fixture (or is it a fitting?) in my house for just over three years.
I didn't buy it; it was left by the previous tenants - probably only left because they could not remove it.

The Kiddiproof socket cover is designed to (quite obviously!) cover any sockets that are within the reach of your baby/toddler.

We all know the dangers of liquids and electricity, and are aware of how metal is a conductor of electricity. Thus, sockets are unsafe around young children who are unaware of the dangers.

It is also sometimes suggested that there is a risk from children putting their fingers in the plug sockets; but this is a silly suggestion as, due to the shape and depth of the hole, it is impossible for a child to injure themselves in this way.

It is impractical, and just as dangerous, to leave electrical items plugged in to cover the sockets, so Kiddiproof (and many other ocmpanies) have designed the Socket Cover.
It is a small, flat plug that is firmly inserted into the sockets, thus making sure that nothing else can be inserted into the socket.

It is sometimes inserted so firmly, that not only are children unable to access the socket, adults cannot remove the cover either - hence my free gift from the last tenant!

I tried on numerous occasions to pull this cover out; it was only when we needed to move my son's fish tank (and really needed the socket) that I managed it.
It took 10 minutes, and three various shaped knives from the kitchen drawer... and these things are supposed to minimise danger!

Incidentally, I recently came across an article that suggests that socket covers may not be as safe as previously thought...

http://www.telegraph.co.uk/news/uknews/5039454/
electrical-socket-safety-covers-are-absurd-and-da ngerous-say-engineers.html

(Please note that I had to put a space into the link as dooyoo won't let me print it as a whole)

Bearing this, and my own experience in mind, I would not recommend Kiddiproof socket covers; or any other socket covers for that matter.

If you do wish to purchase Kiddiproof socket covers, they can be bought in packs of 6, they vary in price, although can be picked up for less than £5.