The Royal Society is a learned society, it acts as a scientific advisor to the British government, the United Nations and the European Commission. It is also the UK's Academy of Sciences and publishes occasional papers that deal with educational policy and practice in the sciences.
The Mathematical Association is a professional body and learned society that functions as the subject association for mathematics education in the UK. Their website features some downloadable resources available to non-members.
Computing at School is a grass-roots organisation that responded to the 2012 Royal Society paper Shut Down or Restart by advocating for the reintroduction of Computer Science to the curriculum in England. There are many resources available from the website.
The British Film Institute (BFI) has a mission to encourage the development of the arts of film, television and the moving image throughout the United Kingdom, including to promote education about film, television and the moving image. A range of educational resources are available for download.