News 24 certainly came from TC10 at one point around 2003 - with locked off cameras and chroma-key/CSO backgrounds. TC11 next door was producing BBC Three News output at the time - so both of the old N1 and N2 were back in use for news shows at the time.
(Incidentally - TC11 housed Working Lunch, Newsnight and Newsround a few years later on physical sets (Newsnight managed to squeeze their hard set in, Working Lunch re-dressed this with clipped on PBUs, and Newsround was rigged inside it) as the Barco sets were installed in TC7 and N6
. The Newsnight Review set was based around the three projectors left over from BBC Three's 7 O'Clock News, which by then had finished.)
I seem to recall the national bulletins moving into TC7 as the N6 Barcos were being added. Not quite sure how they made that work with Newsround and Newsnight.