[Bluecortina]

That will have been the case for many shows still being made in 4:3 in the 00s. Certainly, for example, SM:TV and CD:UK were in 4:3 until the end of 2003, but came from studio 2 at TLS (apart from the last few months at Riverside- but that was also 16:9 capable)- which was making 16:9 programmes right from when SM:TV began in 1998, so that's another one which must have been a conscious/editorial decision  rather than a technical one.

Interestingly though, a lot of CD:UK pre-records were in 16:9 over the last year to 18 months before the switch, and shown in 14:9. Wasn't consistent though, in fact the first performance on the first 16:9 edition was a Will Young pre-record which had been done in 4:3! And I think there were a few specials shown in other timeslots (with a set from a particular artist) that were made in 16:9 too.

‘Customers’ at TLS were initially charged extra for wanting their productions in 16:9, I’m not sure how long that lasted.