There was a Central Music, Weekend from LWT and as mentioned York Records. Granada had a handful of record releases too on a rather nice label.
LWT had a subsidary (I think anyway) called LWI which made Catweazle which was wound down after that show finished.
YTV and Granada, like Anglia did have a computer software department. Not sure if Granada's was TV related or part of the larger Granada Group like their PC business (rentals?)
Slightly back to what I intended this thread to be (public-service/public-sector/state broadcasters running some odd business), China's state-run TV broadcaster CCTV is running a shopping channel (which is a part of their group of digital-only channels). Similarly, China's state radio broadcaster CNR is running two digital-only TV channels: a shopping channel, and a channel about health.