Plugtops can need replacement over time due to usage and wear and tear. They are so important as they come into contact with you the "user" every day and are not thought about very much at all. 

Remove The Plug Wiring Card!

This information they give us on how the plug is wired is very nice, however, if you leave the card on the plug it can cause issues its self.

In the kitchen, it can hold moisture against the electrical socket or if on an extension lead or kettle that makes the plug hot in normal operation this card is not as heat rated as the wall socket or plug is manufactured to