My son has said he doesn't want the vaccine (I actually think he should but it is obviously his decision). I think he's actually worried about the injection rather than anything else.
I accompanied my 16 year old for her vaccine, we picked a time and location to suit her and went together. She did actually suffer side effects and wasn't well at all the following couple of days.
I can't seem to find any information that shows the younger children will have the same options.
I also don't trust the school not to try to talk/guilt my son into having the vaccine despite him saying he doesn't want it. The school have form for this, this isn't just me being paranoid.