The review form specifically states not to send information that was sent previously.
However looking at this page, it indicates the DWP will discard previous information after 2 years, so if the DWP wont have the old information to hand why do they advise in not sending it again?
https://www.gov.uk/government/publications/dwp-information-management-policies/dwp-managing-customer-records-guide
Or have I got it wrong and they still will have the old documents?