Yes three phase Its what my DNO. Installed when de-looping my supply from next door. It would be better when energy suppliers actually have three phase domestic meters.
From May 2023, if you have a single rate 3 phase meter (i.e. not Economy 7 / 2-rate etc.) you will beable to book a smart meter appointment for a three phase meter installation.
You need to live in an area covered by OVO 3 phase skilled engineers to have one. There aren’t many domestic three phase skilled engineers out there though.