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The Assessment Provider for your postcode, not the DWP, will contact you in writing about any appointment for a face to face assessment.
If there are dates that you cannot make then include them in the Additional Information section, you won't harm your claim by doing so.
Our PIP Claim guide covers the assessment and lists the questions that you are likely to be asked.
www.benefitsandwork.co.uk/help-for-claimants/pip Gordon
