Re: Again?
" information your browser supplied, so hardly personal info"
It doesn't matter where it came from. If it's collected by the Register and is capable of identifying a living person (on its own or in conjunction with other information the Register holds) it is definitely personal data under the GDPR.
And note that even a dynamic IP address can be personal data (Patrick Breyer v. Bundesrepublik Deutschland C‑582/14 2016).