Thanks Ingolme,
This is exactly what I was after.
Is there a way to apply a toggleNav to each button here also? Essentially creating 3 ways to close the panels:
Closing by opening another off-canvas menu (e.g. clicking the 'Menu 2' button) -Addressed above.
Closing by the within the off-canvas menu (clicking the '×' button) - Also working.
Closing by clicking the same button ('Menu 1' button)
I appreciate your help on this.