For all of us that have been grumbling over the lack of aftermarket decals for WW1 Tanks, Decalcomaniacs have issued a new set "WW1 Romboids #1", with 1/72 scale markings for Mk I-III. (Yours truly have helped them with info, but I want to point out that I am not involved in this company and gain no profit from it. Just glad to assist.) And I understand that George Eyerman have plans to do more WW1 decals.
I just received my copy of these decals. There are a very large amount of tank covered by this set. I have to find some references for the location. A little drawing for some version should be useful. There is a good explanation but I like drawings I hope that they will release an other set for Mk.IV to Mk.VIII.