The TOTH cut for Buzz came from the Q101 package ‘Hyperlink’ so they were cleared to use that. The Chiltern 5 ‘Hot FM’ cuts however, weren’t available for the rest of the UK market as this was a custom package for the network (which later became part of the Z World demo for Z100).
The Beat 92 was originally for KKBT in Los Angeles so this was available not only to the Hot FM stations, but also to the rest of the UK. Not many stations picked up this package though.