Just thought i would share a book with you all: "Planning & Installing Photovoltaic Systems" by earthscan Ā£95 BREbookshop.com not cheap but boy is it good, its like a bible to PV, everything and more you ever needed to know, from actual manufacturing of the cells to planning and installation to roof detail, you name it its in here - for anyone like me who isnt 100% comfortuble just yet its well worth a read.