Sorry Absolute
it's NMA - New Media Association.
The Royal Rota (RR) are the chosen reporter who cover the RF (Royal Family). only designated papers and agencies can cover them.
For printed papers those are Daily Mirror, Express, Mail, Evening Standard, Telegraph, The Times, The Sun. All of them are represented by the NMA
For TV broadcast it's BBC, Sky New, ITN (so ITV)
For photographs it's Wire Picture Agency, Council of Photographic News Agency and Independent Photographic Association.
Depending on the scale of the event, usual only one of these from each group will be invited to cover the story. So if it's a small conference, they may invite ITV or the BBC, depending whose turn it is, I guess. Then who ever comes out, will share with the rest of the media. So if you recall only one journalist was present for the first showing of baby Archie and he did bring cameras with him, but he had to share with everyone. That is why you never hear reporters shouting out questions to the royals. It seems that the RR was created about 40 years ago, though I think significant changes were made to it after Diana's death- I could be wrong.
The reporter's S, was trying not to be rude and write out the whole word, arse. Pulled out of some reporter's arse (made up).