The BBC Archives are collections documenting the BBC's broadcasting history, including copies of television and radio broadcasts, internal documents, photographs, online content, sheet music, commercially available music, press cuttings and historic equipment. These collections are kept as both original copies, but are now in the process of being digitised, estimated to take until approximately 2015, with some collections now being uploaded onto the BBC Archives website on BBC Online for viewers to see. The archive is one of the largest broadcast archives in the world with over 12 million items.
More information on the Wikipedia page [1].
The website is [2].
See also BBC Sound Archive