Hi and thanks for the detailed response. Yes, that is my control panel and I have just found the fuse box in plain sight under the bench seat in the salon.
The not so good news is that the TV fuse was intact. I had a horrible feeling it would be okay as the LED on the control panel still lights up. I have swapped it anyway, but the circuit is still dead. I'm thinking that there must be an in line fuse somewhere, but I have traced the cable so far as I can see it, but no fuse.
Thanks for the link to the Esterel forum. I do use that quite often and the owner, Charlie, is the font of all knowledge on the brand. I have a question out to him already, but it is a very quiet site and it might be a few days before he replies.
As both the TV and decoder are both dead, I can't think what else might be causing the problem, which is a bit more of a general question for the forum.