@staticsafe My ISP does support v6 (https://aa.net.uk/) but the ADSL modem/router they sold me for it is a puzzle to configure (ZyXEL) and didn't work with my Ubuntu or Raspian systems (they don't get routeable addresses). I realise you don't need one yourself but do you happen to know of any decent consumer ADSL/VDSL modems/routers for v6?