Its currently showing on Fox which used to be known as FX. Apparently channel five also has the rights to The walking dead but they always have to start showing it after it has concluded its run on Fox. So it will most likely be airing in late spring or early summer on five.
As I said above in my post, yes five has the rights and they have to wait until its been shown on fox first. Which means it will be on sometime soon. Its still showing on fox but is coming towards the end of its run.