Links

AQA A-level physics material = This includes past papers and other key materials.
Xtremepapers.com = Contains all AQA past papers from past schemes.
PhET simulations = Many many many useful free easily downloadable interactive simulations. University of Colorado at Boulder "PhET" simulations.
What If xkcd = Answering real questions in outrageous situations...

Hyperphysics = Department of Physics and Astronomy, Georgia State University. Excellent undergraduate info.

The Complete Feynman Lectures on Physics = The ultimate handbook to undergraduate physics, by Richard P. Feynman, Nobel Laureate.

Astronomy Picture of the Day = A picture a day, often related to current events.

Berkley Physics Demo Archive - Extensive resource and archive of demos and experiments in all fields of physics.
Teaching Advanced Physics = Invaluable learning and teaching resource for A-level students. Contains extensive lesson notes, worked questions and solutions. Provided by the Institute of Physics (IoP).
Physics World = The physics magazine produced by the IoP.
Science Daily = Excellent website for up to date info on every area of science in an easily accessible format.
NASA website = Home for useful info about space technology and engineering.
TES = Largest network for teachers in the world. Useful document downloads and general info about teaching. You must be a member to access resources.
Milky Way in HD = A wonderful high definition mosaic photo. This milky way map stacks tens of thousands of photos to create the most detailed picture of our galaxy to date.
Deep-Sky Hunter Atlas (pdf) = A great complete sky atlas for advanced users
Beginners Star Atlas (pdf) = 6 page starters atlas of the sky
Physics Formulary (pdf) = 108 pages of standard equations in physics, for under/postgraduates

YouTube Channels

Veritasium = This is a channel of science and engineering videos featureing experiments, interviews, demos
MinutePhysics = As the name suggests, physics concepts explained in a minute! Good way to start thinking broadly about physics
NASA channel - keep up to date with NASA
VSauce = something to think about.....
Smarter Every Day = nice collection of videos on interesting topics

Brian Greene = American theoretical physicist
Brian Cox = Pop star turned physicist turned educator... the guy who you see on those programs on TV who can get quite annoying
Neil deGrasse Tyson = the American Brian Cox, although older but also talks in 'wonder-speak'
Michio Kaku = theoretical physicist, populariser of science
Phil Plait = aka 'the bad astronomer'
Chris Hadfield = Mission commander for the ISS. Profound thinker... made a music video in space... madness
International Space Station (ISS) = Human space station housing (max.) 6 people at a time
Sean Carroll = theoretical cosmologist, popular science writer
Elon Musk = Engineer and entrepreneur with some amazing ideas! See SpaceX (private space delivery/ travel/ exploration), Tesla (most successful electric car company), SolarCity (major solar initiative), artificial intelligence company OpenAI, and more!
Ben Goldacre = Doctor and skeptic, fighting a hugely successful battle in getting medical data from Pharmaceutical companies. A bona fide quack-buster
Bruce Betts = Planetary scientist. FUN!