Their reply to my request to delete my data:
Thank you for your email requesting your right to be forgotten.
In order for us to carry out this request, we require proof of ID to ensure we only action requests made by the genuine owner of this email account. Acceptable forms of identification are,
- Recent utility bill from the last 3 months (e.g. Gas, Electric)
- Valid drivers License
- TV License within the last 12 months
- Council Tax Letter within the last 12 months
- Title Deeds
European Data Protection Board, “Guidelines 01/2022 on data subject rights - Right of access”, Version 1.0, para. 73
Took me a minute to find, but that’s really great info, thanks!
I’ve already filled a complaint with the ICO since the company continued to refuse to delete my data, so we’ll see what they come back with (their own guidelines say something very similar - “they should only ask you for just enough information to be sure you are the right person”) if they side with the company I will definitely be quoting these guidelines.