[Mike]

Norwich aren't using Thomson cameras any more. The HD upgrades necessitate a change to Sony cameras as part of the kit of parts.

The Thomson 1707s were first marketed in 1999 and stopped being sold in 2003, and were SD 16:9 digital cameras. There's no way, even with upscaling, the picture quality of Look East would be anywhere as good if they were still using them (not even sure they'd necessarily be compatible with the new workflow?).

EDIT: to see the difference in picture quality between the two types in HD, look at the late bulletin at around 1m46s where they use some archive footage in a package from September.