Just for a brief update, I have had my appeal upheld.
Once I had my medical and was deemed unfit due to historic eczema, I did an appeal to Cranwell who denied it citing the AP (which I cited to them in the appeal anyway)
I then sent a further letter asking for more detail and more clarity, where I also went to into greater detail as to when (if at all) my eczema was a factor that affected my life.
They seem to have taken more heed of my appeal the second time and reconsidered it (even though you technically cant have a second try) and have upheld the appeal.
maybe it's role specific or my appeal had enough evidence for them to reconsider it, but I was close to giving up and was thinking "what do I have to lose?"
I wouldn't suggest harassing them or anything, but if you honestly believe your appeal should be upheld and their reasoning is mistaken, maybe give it another try. It worked out for me, but I asked for "clarity" and that seemed to have worked out. They did also say they may be looking at adjusting the AP in regards to eczema being a PMU.
Hope that helps