Hi Mandy
If you have asked for a review, you will be sent a review form to complete. As you have already had it for seven years, I assume you have never filled in a review form before? We have comprehensive information on how you should approach this. You may then have a telephone, face to face or paper-based assessment. If you are given a higher award it will be backdated to the time you put in the request for the review.
benefitsandwork.co.uk/guides-for-claimants/pip BIS