So after the initial set of Markers i did HERE, I have tweaked them so they will fit on 30mm discs if you wish.
Below is what I have come up with as a picture;
What I have gone for are as many conditions as I can, plus a blank one for one when you need others.
For ease of use I have also created a pdf for people to use, which you can download below
I hope people find these useful, rather than scraps of paper 🙂