I originally sent in a D4 back in October last year renewing my class two hgv and because on that form I told them I was drinking 30 units a week and a doctors report showing a slightly elevated GGT I was revoked in January, first of all they classed me as dependent on the letter and I appealed this successfully and they changed it to misuse I couldn't argue that with an elevated GGT, in total that took me up to May where they sent me for my first dvla medical they then refused that blaming lost paperwork, my second dvla medical was in June where after that they refused again because the DD2 that my doctor had filled in ticked no to "is the drinking under control", however from April I had my first liver function test and that was normal and I collected another three of these right up to September, they then accepted this as my 6 months of medical evidence along with another dvla medical in October and another DD2 from my gp with all the corrected questions related to misuse, they have just received my M2 as well for my anxiety and meds and all ticked under control and that's where I am with it mate, 11 months later and waiting on a decision, hope that helps ...