I think there is a channel list that gives an idea of what channels are working at the moment, there is quite a few missing at the moment. Anyones guess if they wil fully come back.
Homeplugs are quite good once you have configuered them correctly works very well. You have to pair them up to each other instructions should be with the homeplugs you buy, just have a read into them and buy a good brand.
I have a pair that I use that incorparates a socket too so I dont lose the use of that socket its plugged to. I use the powerline adapters by Comtrend and they have been flawless.