Summat's up...
....I replied to the point that FOR made higher up yesterday. But it seems to have disappeared.
The faults that I noticed in the other TVs were not BECAUSE of the new TV, it was just that having discovered faults in the new I went and looked anew at ALL the channels on the older TVs. This took me into areas I'd never gone to before - Gay Rabbit Chat?? who knew? I sure as hell didn't.
Anyway I'm getting the original installer to come and do an end to end check from the antenna to the screen(s). He's a really dour Scot** but he's good at his job. I will report back. So thankyou to those who replied. One always learns something new in PPrune - almost every day.
The Ancient Mariner
** and before anyone who knows me jumps in - so am I.