Ah thanks @MrsHamlet
@spanishboundary do you mean speaking or listening? you say both but based on your second post I assume speaking.
MFL is my subject, not Spanish really but I conduct speaking exams for French and German. This year as you may or may not know the exam was changed for GCSE, both AQA and Edexcel (not IGCSE tho). The aim was to make it more accessible (eg instructions for writing and speaking in English not TL, read aloud task which does not require composition of answers, no reading and listening in TL) and one effect of that seems to have been higher GBs. But it is more than possible for sure to get a top grade without being a native speaker.
The way the grades are worked out means it is not necessary to get (for example) a 7 or an 8 or whatever in each skill – the grade comes from the total mark. But obvs you can work out what the mark would need to be to hit the GB for a 9 in each skill. So a 9 in German needed a total of 176, in Spanish 175. That would work out to 44/50 for a 9. High, but not unachievable.
So I would expect a strong candidate (a grade 9 student is a very strong candidate) to score 10/10 for the role play, probs 13-15/15 for the read aloud and subsequent questions, and probs 22-25/25 for the photo card. Even at the lower end of those scales that would be 43/50.
You do not need a bilingual accent. No marks for accent in the role play; marks in the read aloud are for correct pronunciation (so things like garkon for garçon in French would be a major error; a minor error would be saying the h in horrible - even to score 5/5 some minor errors are acceptable) and then for development of answers; marks in the photo card and then discussion are given for development and content of answers (information conveyed) and for range and accuracy of language.
So basically apart from pronunciation in the read aloud, there are no marks actually awarded for fluency or accent.
Obviously a native speaker as noted will have an advantage; but in fact a well-prepared, able non-native candidate can score a high mark. I had a range in the exams I conducted this year but certainly can think of at least two non-native speakers who gave a very good account and will have gained a high mark.
Apols for the essay! There is obvs more detail on this online if needed. Why do you ask btw? did your DC do less well than they hoped? I have seen @ShowDownTime's DC's marks on another thread and agree the speaking is an anomaly, esp if the candidate thinks they did OK (candidates know if they collapsed in tears and even if not, often think they did worse than they did, focusing on one question they missed).