By the looks of things Mitch, wpms is similar to industrial injuries benefit. I know that if claiming the latter and you report a change of circumstances, that your injury has become worse. You may well be called to a medical to establish how much worse your condition has become.
Have a read through this https://www.gov.uk/guidance/war-pension-scheme-mobility-supplement-wpms#changes-in-circumstances
also seek more qualified advice from https://www.gov.uk/guidance/veterans-uk-contact-us
I claim Industrial injuries for my knees and am about to report a change in circumstances as they have got worse.
Joss
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