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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?
Yes, I would ask for an extension but if the files are still not available then make sure the form is returned by the new date, you can always send in the letters as soon as you can.
Gordon