Hi @Wils3 ,
if you are using a Youview box then
Channels 1-299, 600-800 are delivered via your aerial as part of the Freeview service and may vary considerably depending on your location. Your BT TV subscription channels are provided on channels 300-599 and are provided over your broadband connection.
(BBC Channels that you watch on Freeview channel numbers via the aerial have options like connected red button that may launch BBC Iplayer and sport options that will utilise your broadband connection).