Hi,
I have resolved the problem, which wasn't really a problem at all
I started again from basics and found that I had sourced "TV" instead of "DTV" on the television
So I corrected that and re-tuned both the TV and the recorder and now have a perfect picture.
Could the fault that I had, have resulted in changes still taking place with the incoming RF signal at the time I lost the picture? as prior to that point I had no problems, and I changed over from analogue to digital last September or so I thought!!
Anyway, thanks for your input and I have learn't again that "back to basic's" is always the right option
Paul C