The OCR Website
http://www.ocr.org.uk/qualifications/as_alevelgce/physics_b_advancing_physics/
has excellent resources including past papers and support booklets
http://www.ocr.org.uk/Data/publications/support_materials/AS_Level_Physics_B_SM_Booklet_Unit_G491.pdf
Advancing Physics
http://advancingphysics.iop.org/
Wikibooks
http://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)
