This is much better! I was determined to treat the office team to this cake and could not take it in crumbs like my first attempt.
This time I halved the recipe, used 2 tsps. of cocoa powder (unsweetened) instead of the chocolate and baked it for around 45-50 minutes. So now I can add it to my "make again" list.
It still cracked a little on turning it out; I am not quite sure why. I oiled the pan with quite a lot of Crisco and some flour. Maybe a bit less sugar will do the trick.