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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?
Don't worry about what the DM has written, it's a standard letter that they include with all appeals. The Tribunal panel will make it's own decision based on the information before them.
Gordon