Check that all three pins are metal. This is a good start. Don't buy any with 1 plastic pin because if you plug in a UK plug that needs earthing - it won't be earthed.

I too bought the cheap variety of adapters - but what is better are the more pricey ones with plastic pins guides inside the holes. They hold the pins in place better.

All appliances sold here should be for the same 240 voltage so you should not need to worry. Anything brought from America may need to be looked at - sometimes they have a switch in the back to change the voltage input from 110 to 240.

Please do not poke anything in a socket in front of kids - they won't know the difference.

The only thing in your house that needs specialist connections should only be your oven.

Hope this helps.