Note: the complete BBC Archive of tv and radio broadcasts since 1922 is searchable here - https://genome.ch.bbc.co.uk/
Please get in touch with your liaison (subject) librarian if you need a programme or broadcast from the BBC archive that isn't available on Box of Broadcasts (see above)
The Library has a loanable collection of DVDs and Blu-Rays on floor 5, these are all listed in Library Search. More information on the Modern Languages subject guide
There is a great deal of free audio-visual content available on the Web. A small selection of some useful sources are listed on the following guides:
Relevant sections of the subject guides will also include audio-visual resources pertaining to that specific field