Thanks for the reply
Yup my speakers are a google group (although I did create a universal media player of all my speakers to enable voice control as per HowTo: Control Group Volume on Google Home / Nest Speakers (SONOS patent lawsuit) - #5 by capstan1)
So what I was doing is trying to use a similar method to create a scene in google home that I could add to routine.
So under configuration>automation and scenes I created a script first using call service media player play_media with the entity being my speaker group and then another action with the same except the entity was spotify.
The first action creates a connection to the speaker group with the source showing as default media player on google home, and the second plays spotify but off my phone rather than to the speaker group
I don’t have any local files on home assistant yet but I will give that a go thanks for your help