txeriff - Seems nobody knows anything what they are talking about here!
SFC does not do ground school! - London Met is normally for SFC.
Oxford, is in Oxford.
Bristol GS is distance learning, you study at home, and go few weeks to Bristol.
I recommend first you use the search button and find out what you want, and try to learn some of the right terms, so people know what you are asking about.
Either you do full time at school or you do self study/distance learning. You can't normally just drop by when you feel like it.
In school - 6 months, self study 12 to 15 months study time. Good luck!