Cuckoo IPv6

My firewall has just popped up saying that IPv6 is available on my Cuckoo connection (former Swish Fibre now OneStream). Does anyone have any information on settings? Is it SLAAC or DHCPv6 for example and any information on prefixes?

I have the same setup. It seems to be a beta, not a supported product, and works on and off. It's working for me at present, but twice before it has worked for a month or so then stopped, and I have to disable IPv6 at the router as it causes problems.

My router gets a /64 WAN address via DHCPv6. It also gets a delegated prefix from a different address range, don't know what size because my simple router doesn't expose that, but others have said it's a /56. The router extracts a /64 prefix from it and circulates that round the LAN in RAs. The prefix has a stupidly short lease time of 300sec. Devices use SLAAC or similar to make GUAs from the prefix.