At the moment the test site is using an old mikrotik HAP AC router I had sitting around, connected to the starlink PoE injector and antenna. I've tried as a dhcpv6 client with no good results, but will dig into the mikrotik documentation as a dhcp client further. 
> On 23 Apr 2021, at 16:03, Thomas Schäfer <tschaefer@t-online.de> wrote:
> 
> Am Freitag, 23. April 2021, 11:18:17 CEST schrieb Tim Chown:
> 
>> Is that a local choice, or does Starlink not carry IPv6?
> 
> A very interesting setup was yesterday documented by awlnx via twitter.
> 
> https://twitter.com/awlnx/status/1385263694649700353
> 
> She got it working. Some things I can remember:
> 
> inbound is open, she presented an IPv6-only webserver, 
> at least yesterday it was functional: 
> https://atlas.ripe.net/measurements/29792632/#general
> 
> there are some strange things: mtu is only 1280
> icmp echo requests/answers are faked
Thanks Thomas, Eric and a couple of off list comments on IPv6.  It seems you can get IPv6 working, and get a prefix via DHCPv6-PD, and support's coming more formally in May or thereabouts.  Good news :)
Tim