[Humphrey Hacker]

They have a service called CNS (Central News Service) which provides national news clips and bulletins for the local and nations stations. I assume it was that. I'm not sure if the bulletins are put out every hour throughout the day but most stations only seem to use it in the evenings and weekends

It replaced an older long established service called GNS a few years ago. CNS is based in Salford whereas GNS was came out of London.

During covid to save on staffing there was another generic BBC News bulletin that Radio 2 and 5 Live used amongst others. I think Radio 4 might have at some times too

Whereas with local commercial radio there are various providers such as Sky, Global and Radio News Hub.