@mumsneedwine, I don't think there's any consistency really. Grades aren't being done blind at DH's school or the one our boys go to.
Having said that, there are several groups in the subject DH teaches, so a number of teachers are each marking one assessment. It's a very large 6th form with lots of Year 12 entrants, so DH hasn't a clue who most of the students are except those in his group. They'll be moderated too so it would be very obvious if any of the teachers involved were marking their own students' work more generously than any one else's!
As for my sons' school, who knows. They've been chaotic throughout, there's no consistency between subjects in terms of number of assessments, or timing, or whether they are told raw scores, or anything at all really. The departments teaching DTs' chosen university subjects are great, very organized and professional etc., but it's not really them we're worried about.
DT2's final assessments have both had to be postponed until the very end of next week, unfortunately, because covid is back in school and most of the class he's not in are self-isolating. So he will have been doing assessments continuously since the week before Easter (though I don't know if those ones will even count now, as they were done before all the guidance had been issued iirc): 6 each for 2 subjects and about 14 in the other, a science subject that he very much regrets choosing, for a whole host of reasons!