In my experience, it's best to write the claim form as if it's a new claim and they don't know anything. I've wrote "no changes" in the past, and my claim was simply dismissed, despite having had PIP in the past.
The guides within the menu's will help you with how is best to word things to give you a better chance of success.
Regards, Chris.
Nothing on this board constitutes legal advice - always consult a professional about specific problems
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