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Welcome to the forum, you might want to have a look at the following FAQ which explains 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?
The PIP.1021 is just the covering letter, you should have received a new PIP2 to complete. This is standard for when the claimant reports a Change of Circumstances.
Gordon