BBC Knowledge idents 1999-2002 

Idents from throughout the lifetime of BBC Knowledge, starting with an announcerless ident recorded during the channel's promotional barker which ran during daytime hours.
Then more of the original 'ladders of learning' idents, followed by the themed idents used from April 2000. The compilation concludes with the channel's final ident used from 2000-2002.
More on BBC Knowledge idents at Des and Mick - TV & Radio:
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