he has to choose two books for a piece of extended written work (he said dissertation), and I would like to pick the brains of Scottish mumsnetters and teachers about the choice of books for this.
He is correct; he will be doing a disseration on substantial novels (not generally o level texts) and his teachers will give him the AH guidance and point him to the nearest uni library for the lit crit sources to read. He then has to formulate his dissertation title, do his reading and produce a 5000 word essay, which is sent to the exam board along with his NAB results, before he takes his final exam.
Are there any books or topics that get done to death, and will make the examiner yawn when they see them again?
This is a matter for discussion by your son and his teacher. You may not be aware that an Advanced Higher is equal to the first year of undergraduate study in a Scottish uni and, should he continue to read English at university, an AH will allow him to begin in the second year, if he wishes.
Discussing this with dh last night, he came up with one suggestion - The Historian by Victoria Kostova, and Bram Stoker's Dracula - we wondered if it would be interesting to compare and contrast the treatments of the Dracula story, and vampire stories in general.
This is not a family piece of work! Your son is studying at undergraduate level - he needs to do this himself, with the guidance of his teacher, to produce a scholarly dissertation that would be acceptable from a 1st Year undergrad. Your suggested task is more appropriate to GCSE, I'm afraid.
what is actually required in this piece of work
That it is all the candidates own work. He will be supervised during this time and any hint of cheating (ie mum and dad) will disqualify him.
I was thinking Dickens, Austin and Bronte (and To Kill A Mockingbird, because I did that for O level and it ruined it for me).
The best advice I could give you would be to leave your son and his school to it - from what you say here, you might be in danger of disadvantaging him, albeit with the best intentions. After all, you won't be following him around at uni next year.