Previously had my Zinwell Freeview Receiver (ZMT-620HD) plugged into our old TV and simply unplugged it from the old one and plugged into the replacement TV.
That's where the fun begins.
Swapped to the appropriate channel for Freeview and suddenly getting "No channel available".
So I went and did a automatic scan for channels and it came back with nothing, and just displays "No channel available".
I can confirm that the antenna cable that I'm using will give me Prime, Ch4 etc when plugged directly into the TV.
So it appears that I'm getting good reception (perfect picture on Prime and C4 as well as 1,2,3).
Googled "no channel available" and came up with very little (when combined with Zinwell).