Malcolm, don't think there is enough to fill a book.
You will probably learn as much as you need to know by visiting a few SIPP providers websites, google's your friend. Some are better than others.
Wikipedia is a start http://en.wikipedia.org/wiki/Self-invest...al_pension
I think Osborne changed the rules in the last budget so Wiki may not be fully up to date but the providers should be by now. Something I need to look at.
