ryanjmclaughlin,
Thanks for the pointer, I should have read the data sheet more carefully - you're right the info is there.
To clarify, it's 230-240V/50Hz, used in New Zealand, Australia and the Pacific.
I've done a little work with HV before but not a huge amount, I'd be installing on a separate board in a box isolated from the Arduino. More than happy to work together if you're interested.
Cheers,
hads