This year (thinking specifically of Maths KS2, but I suspect it applies more generally) markers have been told that in addition to marking, they need to manually enter marks for each paper onto an online database at the question level. Typically a marker will have something like 450 papers with around 45 questions or part questions per paper, so that's a fair bit of extra work. They also have to sit a standardisation exercise after every 80 papers they mark.
None of this is bad, exactly, but (of course) the amount a marker gets paid per paper marked has not increased at all.
Oh, and the elapsed time within which they need to complete all their marking has been reduced to roughly half of what it was last year.
I know of several markers who have elected not to do it this year after learning of the new deal (and given that I don't know huge numbers of markers, that's a significant proportion ).
I wonder whether there will be an issue nationwide with getting all the papers marked and graded within the official deadlines?
If so, then you heard it here first . If not, then -- say, look, an aeroplane!