This session took place at AIR Studios in London. The tracks were filmed for use as promo videos. 'Idioteque' was filmed in black and white and aired on a webcast (this footage would later be released on The Most Gigantic Lying Mouth Of All Time); the same performance was simultaneously also filmed in color for a TV promo. The other three songs were probably also all filmed in black and white, possibly also in color.
'In Limbo' was shared on july 13th 2022 on Radiohead's Youtube channel:
'Optimistic' and 'Motion Picture Soundtrack' appeared in 2022 in the Kid A Mnesia Exhibition, where they played in the "Little Cinema" room.
Some of the tracks were broadcast from december 11th-14th, one track per day, on the BBC Radio 1 'Evening Session'. The BBC website mentioned november 15th 2000 as the date for this session, which contradicts Steve Lamacq's narration, which points towards late november. However, since "Idioteque' from the BBC broadcast is identical to the filmed version from AIR studios, it's likely that all 4 BBC tracks come from that session in september.