Hi Shaft, channel 5 no longer shows the Walking Dead and you cannot get it on Freeview any more, you can only get now through pay TV, Now TV box, Sky Subscription Talk Talk etc.
I have got a Now TV box entertainment pack for only £6.99 per month and you get to see most of Sky’s top shows plus 12 live streaming Sky’s channels over the internet and also catch up and box sets.
Or if this is not for you then there always getting the DVD when it comes out.