British Broadcasting Corporation
The British Broadcasting Corporation, when not referred to as "the Beeb", or "Auntie Beeb", is almost always referred to simply by its initials as "the BBC", is the world's largest broadcaster. It states that one of its main public purposes is "Bringing the UK to the world and the world to the UK."
Websites and podcasts
As an internationally renowned ambassador of English, apart from its news service, and the World Service, it also devotes a large amount of resources on TV and Internet to English language teaching, offering grammar summaries, listening exercises, interviews and so on.
Its website "Learning" acts as a central reference point to the various services it offers. These include the site Teaching English!, which it runs in collaboration with the British Council and which provides free lesson plans and audio material.
Yet more material can be found at its site "learning English". Although this site is mainly directed at learners, it also has some useful material for teachers (also including lessons) in its "learning English - for teachers" section.