Hi Souter
You can contact the DWP at any time and report a change of circumstances but it comes with a warning, even if your condition has deteriorated you still may not be eligible.
When you apply for a change of circs DWP will look at your whole claim not just the mobility component.
You need to check our guide to see if you fit the criteria, have a read of our latest guide;
www.benefitsandwork.co.uk/help-for-claimants/pip Do you know when you will be re-assessed? If it is not too far off, then you may want to wait until you get nearer the date before contacting DWP.
Gary