Oh, OK, thanks for clarifying.
I'm very happy with where this ended up - when the printer starts up it displays a message telling me to run the Delta_Start macro.
This sets the trigger (M581), checks which Smart Effector is installed, then homes the printer, runs delta config and then disables the trigger condition.
It works great and I won't get caught out with the Volcano installed and think I have the shorter v6!
Thanks for your help.
Richard