“I normally refuse to join in campaigns but this seemed so important, and the ‘safety’ covers so absurd and dangerous, that I agreed”
Author, TV presenter & Patron of FatallyFlawed
Dr Adam Hart-Davis

The following are links to other sites dealing with electrical safety issues:

Safety advice for parents and child carers a UK Government site.

Home Safety Policy Statement from RoSPA - The Royal Society for the Prevention of Accidents

Electrical safety advice from The Child Accident Prevention Trust

Switched on Kids an excellent tool for helping children understand the dangers of electricity.

Electrical Safety Council provides a wealth of information on safety in the home.
 

The bottom line is:
Safety is designed into UK sockets - plug in covers reduce safety!