Apple have issued a safety notice to all customers who may have an affected adapter.
If you have a wall plug adapter with 4 or 5 characters (or no characters) running up and down on the part of plug that attaches to the adapter, then it is part of the recall.
Check all of your Apple plugs (even if you have plugs you use in other Countries).
Apple have an exchange process for all affected adapters. You will need the serial number from your iPhone, iPad etc and you can either take the adapter to your nearest Apple store or request a replacement online and they will provide you with a newer version of the adapter.
Click here to visit the Apple site and view the recall information.