I notice that spell focus feats are not in the guildhalls I have looked in (invoker and Illusionists). It would make sense to me, that the guildhalls have these feats in them.
The help files state:
"The trainer in question must be a member of the specific school you wish to focus upon."
Spell Focus Feats
Spell Focus Feats
Seek ye victory? Ye shall eventually find defeat.
Seek ye defeat? Ye shall most certainly find it.
Seek ye nothing? Then all ye can find is victory.
Seek ye defeat? Ye shall most certainly find it.
Seek ye nothing? Then all ye can find is victory.