Just to update and put the record straight I have now received an email from Zen's IPv6 Trial team.
Basically having told me how to configure the router they then say that they "have a number of customers with Netgear routers struggling with their IPv6 configuration". I suspect that this is putting it diplomatically that Netgear routers do not work for this type of configuration!
The only other suggestion is to contact Netgear for help which I have done. If that is no good (and I will not be surprised if that is the case) then I will have to eventually bite the bullet and buy a different make of router.
Edited by Jax2 (Thu 17-Dec-15 15:49:01)