Solved it now but was trying to add Radio Caroline as a non freesat channel.
The info I have is: 11428 H 27.5 2/3 4101
I try 11427 H Select no network search, Radio only, and search.
Caroline is found, I save it. Then press Guide - where is it.
Three more goes - nothing.
Then I search again but selecting All types (Radio and TV) - found again with some TV channels. I don't save.
Press guide and there is Radio Caroline.