Just spotted this advert for side new panels on e-bay. They look quite good, I may get some to try the fit while mine is stripped down.
http://cgi.ebay.co.uk/outer-side-panels-for-commer-vans_W0QQitemZ190072933133QQihZ009QQcategoryZ9903QQrdZ1QQcmdZViewItem
http://cgi.ebay.co.uk/outer-side-panels-for-commer-vans_W0QQitemZ190072933133QQihZ009QQcategoryZ9903QQrdZ1QQcmdZViewItem