The moderation isn't really fair but I don't think they have time to moderate all papers.
Dd was potentially in an awkward situation with her course work.
There were 3 teachers. teacher 1 (teaching one class) very new to teaching, who seemed to aim to be fair. Teacher 2 (head of the subject with 3 classes), teacher 3 (who dd had, again with 1 class)
Unbelievably, teacher 3 told that his class that teacher 2 over marks, so he deliberately undermarks to make up for it. DD's seen the marks for previous years, and, yes he significantly undermarks. She reckoned having gone through her coursework that he undermarked hers between 6 and 10 marks.
But here's the real rub. When they moderate the coursework and pick ones at random, there are three times as many from teacher 2, who over marks. So generally the coursework is moderated down again.
Thankfully in dd's year it's only gone down one mark, and she got her firm uni place so it doesn't matter.
However it would take her marks up from being a safe A to possibly being just into the A* category.
This particular subject has a history of not getting good grades.
It's not worth appealing the coursework mark. However I am currently composing a letter to her 6th form SLT outlining several, to my mind, serious issues in the teaching (not just in this subject) and this will be mentioned. I suspect they will just put that down as student talk, however if they wish to look at the coursework marks for those teachers it should be clear that there is an issue.