With a little help from my 'friends' here and one mate it is now solved and some of your inputs are spot on. RF's are still used, at least on the latest Panasonic recorder I have and on a JVC TV. I think I was thrown by the diagram in the user manual starting at "1" and going south but the best way was antenna in the last unit up to the TV RF, which was OUT and is now IN. The Humax HD has the HDMI on 2 and HD is on 2. Easy switchover and the 'deep colour' that panasonic sell is a surprise and very good. in the system I also have a scart in a line to the TV scart - its actually better than before.
I think that's enough. But many thanks for all your help.
PPP