As NC-Jay reported a few days ago, [Live Internet TV] received something of a content refresh, bringing in a new section dedicated to UK streaming channels.
As was noted then, the streams seem to be downlinked from satellite - a method that brings questions and issues with it, including the legality of such a stream and issues such as the Satellite receiver going into standby mode and rebroadcasting a simple dark screen from time to time.
Assuming, however, that the channel you'd like to watch is not currently on standby (either via the Sat. receiver or the BBC broadcast station) then you'll find considerably more professional content on these channels than on most of the other english language channels (I can't comment on the other languages, I can't understand them).
Rather than focussing on Religion and home shopping, these BBC channels offer real entertainment value with shows like Big Bang Theory and Friends -- movies such as Butterfly Effect (on last night) and Broken Arrow (on tonight).
So for you folks who'd like to know WHAT you might tune in for, here's a spattering of links to get you some scheduling ideas. Note that the online schedules are, of course, listed in British Standard Time (BST) which is GMT +1. For reference, Eastern Daylight Savings Time (EDT) is GMT -4. That puts a difference of 5 hours between Eastern North America time and British time. Just enough, mind you, to pretty much guarantee that it is ALWAYS PRIMETIME at your house.
BBC 1 - [One of two flagship BBC TV stations] Schedule
BBC 2 - [Second of two BBC flagship TV stations] Schedule
BBC 3 - [New drama, talent, comedy, films, and accessible news] Digital only BBC station Schedule
CBBC - [Children's BBC ] Schedule
Cbeebies - [children 6 and under] Schedule
BBC News - [yes, news] Schedule (I CANT FIND A SCHEDULE LINK FOR THIS ONE)
BBC Parliament - [UK Government] Schedule
ITV 1 - [One of 4 independent TV stations - ie: not government sponsored] Schedule (this schedule link has LOTS of other channels too, including most [maybe all?] of the others listed here)
ITV 2 - [2nd of 4 ITV stations - free-to-air entertainment] Schedule (available above on ITV1 link)
ITV 3 - [3rd of 4, entertainment] Schedule (available above on ITV1 link)
ITV 4 - [4th of 4, "male oriented" ie cops, sports, with dramas and comedy too] Schedule (available above on ITV1 link)
CITV - [childrens ITV] Schedule
Channel Four - [commercially self funded, publicly owned, entertainment] Schedule
More Four - [aimed at 35-60 yr olds] Schedule (available @ Channel Four schedule)
E 4 - [entertainment] Schedule (available @ Channel Four schedule)
Film 4 - [feature films] Schedule (available @ Channel Four schedule)
Fiver - [drama and sitcoms] Schedule
Five USA - [again, looks like drama and sitcoms to me] Schedule (available at Fiver Schedule link)
Also note that many of these sites have MOBILE sites. For example, Channel_Four_Mobile is a great page to pull up on your fancy little cell phone (yes yes, I'm a phone geek too) to help you find a program you'd like to watch.