http://uk.real.com/partners/channel4/
Is anyone subscribing?
There are two options. One at £4.95 a month. The other £9.99 a month. However with the £9.99 option you can get a 14-day trial. If you continue after the trial you are stuck on the higher price though.
Another disadvantage is having to install the RealOne program. In my opinion it's a generally useless piece of software.