There is a Joint Service Medals Section at Innsworth - do not have an extension number but try phoning 01452 712612 and ask the MOD Operator for the Joint Service Medals Section (cannot believe I am suggesting this but you can give it a try) and you will get through. Last time I dealt with them when I was serving, they were excellent. Good luck - they were scheduled to move at some stage but 6 months ago theyt were still there.
Ed