The
Smithsonian Channel started broadcasting in the UK at about midday today.
I've had a quick look and it seems to offer a promising line up for anyone who enjoys factual programming, modern history, science, wildlife documentaries, etc.
Ad breaks seem rather lengthy so record and fast forward is probably best.
Available as follows:
Freeview Ch 99 (SD)
Freesat Ch 175 (HD)
Virgin Media Ch 295
Sky Ch 195