1. Open the BBC radio station URL in Music (e.g. itls://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_radio_two/bbc_radio_two.isml/bbc_radio_two-audio=320000.m3u8) and add it to a playlist (e.g. "BBC Radio 2")
2. Create a folder within plugins called PlayRadio2.
3. Within that folder create an AppleScript called Radio2.scpt

tell application "Music"
	play playlist "BBC Radio 2"
	set airPlayDevices to (get name of AirPlay devices) --returns a list of names
	set current AirPlay devices to AirPlay device (item 2 of airPlayDevices) --sets device to item 2 of list
	
end tell

4. Also create a config.json file containing

{
	"pluginName": "Radio2",
	"pluginDescription": "Starts Playing Radio 2 and streams to HomePod Mini",
	"protocolVersion": 1,
	"actions":
	[
		{
			"actionName": "PlayRadio2",
			"fileName": "Radio2.scpt"
		}
	]
}

5. Reload plugins and off you go...