Does Zen provide IPv6 by default for all new customers? I can't make out from their website - all I can find is that they support it and an email address to which existing customers should send their request to enable IPv6.
As far as I remember they start you off with IPV4 but as you said just email them once you are connected and they will activate IPV6. Maybe if you order by phone they might supply IPV6 from the start if you request that.