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Welcome to the forum, you might want to have a look at the following FAQ which explain where everything is
Welcome to Benefits and Work In case you are not aware, your real name appears to be showing in the forum, if you want to change this then follow the instructions in the following FAQ
My full name is showing, how can I stop it?
It may be that your computer record was not updated in time to prevent the letter being sent.
Although your award means that you don't need to send further Fit Notes it may still be worth your contacting the DWP to make sure that there is nothing wrong.
Gordon