I hope this link works.
they don't list GPA/WG it's under "other"
dwp.gov.uk/publications/spe...
A-Z of medical conditions
This medical guidance (for adults and children ) for Disability Living Allowance and Attendance Allowance Decision Makers has been developed by the
Department's Health and Wellbeing Directorate with help from experts involved in patient care. It contains background information on the more common
medical conditions in DLA/AA claims, their treatment, the likely disabling effects together with the likely impact on ability to self care and get around.
Vasculitis:
Behcet’s disease
NHS Choices
Polyarteritis nodosa
Decision Makers are advised to discuss with the Departments Medical Services provider if necessary
Polymyalgia rheumatica
Polymyalgia Rheumatica
Temporal arteritis (Headache)
Temporal Arteritis
Vasculitis - Other / type not known
Decision Makers are advised to discuss with the Departments Medical Services provider if necessary