I got round to listening to the Feedback episode that I think Jim was referring to:
https://www.bbc.co.uk/programmes/m002975q (start @ 15'30")

The arguments in favour of a reciprocal agreement for Ireland, as agreed in the MOA of the Good Friday Agreement are very strong - it does look as if the BBC hadn't thought about that. 'Radio Ulster to be unavailable thoughout Ulster' would be an embarrassing headline!

The RoI Government should be lobbying, if they aren't already.

Another Feedback later today:
https://www.bbc.co.uk/programmes/m0029jk5