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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?
Providing you can claim JSA and not Universal Credit then it is possible to backdate the claim but it would b unusual for it to be allowed, you would have to show that there was a significant delay in you being notified about the ESA Decision to have any chance.
Gordon