Is it possible to get Tasker to play the next song in Spotify In Tasker, there is a Media Control action which allows me to move to the next song however it only seems to work for the default Android player.

Is it there a way to hook Spotify up to do this?
Yes it is possible, but using Tasker's built in Media Control Next will not work.

For the action you need to use Script --> Run Shell, and as the command enter "input keyevent 87" without quotes. This is the Android API:

https://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_MEDIA_NEXT