Had any of the jurors read about Luke Mitchell prior to them being selected for jury service
I was a bit surprised at your question, but maybe you did not have an interest in the case 17 years ago and don't live anywhere near the area.
As someone who does live fairly near and read newspapers daily (and still do despite the internet) in 2003-2005, I can assure you 100% that all of the jury will have read dozens of negative articles about Mitchell every other day in the year before the Trial. At that time in Scotland virtually the whole population knew about Mitchell, because newspapers printed a different horror story about him almost daily and that isn't an exaggeration. It was brainwashing on a level with communism and state TV. Obviously I don't remember all of it but here are some examples, many of which were on the front page:
Mitchell is a devil worshipping Satanist
Mitchell is the "Devil's Spawn"
Mitchell killed his previous dog and hung it by a rope from his front door frame.
Mitchell is obsessed with Marilyn Manson
Mitchell has a keen interest in images created by Manson and was fascinated by the "Black Dahlia" murder
Mitchell is a Satanist because he stored bottles of urine in his bedroom
Mitchell killed [Name removed] because he was trying to copy the "Black Dahlia" murder
Mitchell tortured animals as a child
Mitchell is the Son of Satan
Mitchell scribbled Satanic messages on his school books proving he is a Devil worshipper (the scribblings were mostly from the Max Payne computer game, but newspapers never mentioned that).
That's just some. Trust me, there was plenty more. The result? Everyone in Scotland read all of this and 99% of them believed it, including me, so in short....yes the Jury will have read all of this too and discussed it with people in the lead up to the Trial because it was being discussed everywhere. None of the above points were ever found to be true. There was no evidence produced that any of them were true. He did store urine bottles, but the link to him being a Satanist because of that was obviously never proved because it's just plain stupid.
It would be stating the obvious that a fair trial in such circumstances would be impossible but that's another debate.
There was someone else who was a huge fan of Manson, but the Police didn't investigate that. They didn't investigate much really apart from Mitchell. Inspector Clouseau could have done a better job.