I have re-booted firestick and router - no difference
I shall see what it is like tomorrow and maybe look into getting a VPN
All right - I have sussed it !!!
I wasn't happy with the quality of IPTV transmissions (I'm used to Cable quality !), and I noticed that most of the channels listed as FHD were only in 720p. so I started searching around and found a load listed as 1080p. So I stuffed all these channels into my Favourites - yesterday they were working, today none of them are working !!
I've come out of my Favourites and picked BT sport 1 from the main channel list, and it works fine...…..
Sorry for causing bother ..