J1m Am I right in assuming I no longer have to set a nightly WW house battery charge schedule if the IO feature is in use?
Correct, we automatically assign the default IOG slot, whether your car is plugged in or not.
J1m If I plug my EV in, creating charging windows during the evening, how does that interact with the running export schedule - does the export stop temporary or fully, or does the export stop the EV charge happening?
We're not doing anything special around this, so you will end up with possibly conflicting schedules. Best may be that if you plan to plug EV in, toggle your export to inactive.