I can confidentally say there will never be another commercial station on longwave in the UK or Ireland on 279, 252 or anywhere else....
In 1989 most peoples listening choice in the UK was still only Radios 1-4, a BBC local and 1 or at the very most 2 local commercial stations. Even London only had three commercial stations at that point. And even that choice wasn't that great for teenagers. The commercial stations still had hefty PSB requirements, Radio 1 was arguably stuck in the past with aging DJs, Radio 2 played mostly pre 1960 music, BBC locals had a lot of speech (and also played older music) and of course BBC Radios 3 and 4 were classical and serious speech stations respectively.
So in 1989 a new radio station on 252 was still a big deal, and people were willing to put up with the vagueries of longwave reception to hear non stop top 40 music with very little speech.
Fast forward to 2015, and no one would care. I doubt todays teens even know where to find the longwave button. If they are cricket nuts, they will probably have a DAB radio, otherwise it's Radio 1 or Spotify......